diff --git a/fs_add_quest_steps.lua b/fs_add_quest_steps.lua
index 16aa6c7..31bdcc5 100644
--- a/fs_add_quest_steps.lua
+++ b/fs_add_quest_steps.lua
@@ -59,6 +59,28 @@ end
 --]]
 
 
+-- helper function: find out if a quest step is required by other quest steps
+yl_speak_up.quest_step_get_required_for_steps = function(step_data)
+	local required_for_steps = {}
+	for s, d in pairs(step_data) do
+		required_for_steps[s] = {}
+	end
+	for s, d in pairs(step_data) do
+		if(s and d and d.one_step_required and type(d.one_step_required) == "table") then
+			for i, s2 in ipairs(d.one_step_required) do
+				table.insert(required_for_steps[s2], s)
+			end
+		end
+                if(s and d and d.all_steps_required and type(d.all_steps_required) == "table") then
+			for i, s2 in ipairs(d.all_steps_required) do
+				table.insert(required_for_steps[s2], s)
+			end
+		end
+	end
+	return required_for_steps
+end
+
+
 yl_speak_up.input_fs_add_quest_steps = function(player, formname, fields)
 	local pname = player:get_player_name()
 
@@ -103,9 +125,56 @@ yl_speak_up.input_fs_add_quest_steps = function(player, formname, fields)
 			work_step = liste[selected.row - 1]
 		end
 	end
-	if(work_step) then
---		minetest.chat_send_player("singleplayer","SELECTED: "..tostring(work_step)) -- TODO
-		return
+
+	if(not(work_step)) then
+		return -- TODO
+	end
+	local q_id = yl_speak_up.speak_to[pname].q_id
+	-- TODO: check if the player can access that quest
+	if(not(q_id)) then
+		return yl_speak_up.show_fs(player, "manage_quests")
+	end
+	local quest = yl_speak_up.quests[q_id]
+	if(not(quest)) then
+		return yl_speak_up.show_fs(player, "manage_quests")
+	end
+	local step_data = quest.step_data
+	if(not(step_data)) then
+		return yl_speak_up.show_fs(player, "manage_quests")
+	end
+	local current_step = yl_speak_up.speak_to[pname].quest_step
+	if(not(current_step) or not(step_data[current_step])) then
+		return yl_speak_up.show_fs(player, "manage_quests")
+	end
+	local mode = ""
+	if(pname and yl_speak_up.speak_to[pname] and yl_speak_up.speak_to[pname].quest_step_mode) then
+		mode = yl_speak_up.speak_to[pname].quest_step_mode
+	end
+
+	local required_for_steps = yl_speak_up.quest_step_get_required_for_steps(step_data)
+	if(step_data[work_step]
+	  and step_data[work_step].one_step_required
+	  and #step_data[work_step].one_step_required < 1
+	  and step_data[work_step].all_steps_required
+	  and #step_data[work_step].all_steps_required < 1
+	  and #required_for_steps[work_step] < 1) then
+		-- this quest step is definitely suited
+--		minetest.chat_send_player("singleplayer","SELECTED ok: "..tostring(work_step)) -- TODO
+		if(mode == "add_to_one_needed") then
+			if(not(yl_speak_up.quests[q_id].step_data[current_step].one_step_required)) then
+				yl_speak_up.quests[q_id].step_data[current_step].one_step_required = {}
+			end
+			table.insert(yl_speak_up.quests[q_id].step_data[current_step].one_step_required, work_step)
+		elseif(mode == "add_to_all_needed") then
+			if(not(yl_speak_up.quests[q_id].step_data[current_step].all_steps_required)) then
+				yl_speak_up.quests[q_id].step_data[current_step].all_steps_required = {}
+			end
+			table.insert(yl_speak_up.quests[q_id].step_data[current_step].all_steps_required, work_step)
+		elseif(mode == "insert_after_prev_step") then
+		elseif(mode == "insert_before_next_step") then
+			return
+		end
+		return yl_speak_up.show_fs(player, "add_quest_steps")
 	end
 
 --	minetest.chat_send_player("singleplayer","FIELDS: "..minetest.serialize(fields))
@@ -173,23 +242,7 @@ yl_speak_up.get_fs_add_quest_steps = function(player, param)
 
 	local step_data = quest.step_data
 	-- find out if a quest step is required by other quest steps
-	local required_for_steps = {}
-	for s, d in pairs(step_data) do
-		required_for_steps[s] = {}
-	end
-	for s, d in pairs(step_data) do
-		if(s and d and d.one_step_required and type(d.one_step_required) == "table") then
-			for i, s2 in ipairs(d.one_step_required) do
-				table.insert(required_for_steps[s2], s) 
-			end
-		end
-                if(s and d and d.all_steps_required and type(d.all_steps_required) == "table") then
-			for i, s2 in ipairs(d.all_steps_required) do
-				table.insert(required_for_steps[s2], s) 
-			end
-		end
-	end
-
+	local required_for_steps = yl_speak_up.quest_step_get_required_for_steps(step_data)
 
 	local formspec = {}
 	table.insert(formspec, "size[12.5,17.3]")