Dear 9 names later~
The Forum can be a bit overwhelming to start with, it certainly was for me. There are a few threads that help, they are in 'sticky' threads at the start of Forums/Welcome and orientation
Topic:Newbies guide: 5 tips for getting the most out of the forums (UPDATED)
Topic:Before starting a new thread...have you tried the search function?
Forums etiquette: give support to receive support
Topic:Welcome! A post about how our forums are moderated (please read, it's fun, I promise)
Topic:Can't find your post? It may have been moved
As to what you can post, that is covered by the Community Rules (Red rectangle on every page). These rules are necessary and are there to give everyone a safe place to come to.
To answer your specific questions it is not possible to insert a post anywhere inside an existing thread, you have to add it to the end. So if you see something you relate to then by all means post, but do it with courtesy as you would expect when joining a conversation.
It's not appropriate to place a post in an existing thread that is on a completely different topic, but again that is just courtesy.
You can start a thread - as you have done here, choosing the most appropriate place to put it (Social, Welcome, Depression ... and so on.
Normally one only makes a different thread if the subject matter is a very clear cut change. So If you first started a thread when you were new, setting out all your details and seeking advice, then you would normally keep on using it, even if the subject 'drifts' a little.
This way people that respond have both your location and details right there - and stops you having to repeat yourself in new places.
I hope this helps
Croix
