In the tutorial I learned to use the GREETING with a custom message to add my new topics. But I don't like having the silent greeting, I'd rather have a generic greeting to introduce my topics (use addtopic in the script box).

How can I get my NPC to use any of the generic greetings and add my new topics?

I'm currently trying to do it in the Quest window, not the NPC Dialogue window as the tutorial says that is bad idea.

Add a script to the quest:

scn AddTopicScriptBegin Gamemode ;put any conditions you need in an if block here (like if you want the topic to add only at a certain quest stage) addTopic YourTopicID ;endif here if you have a conditionEnd