Well a description of posting rules can be found in the official FAQ/Rules page over here:
Menewsha Avatar Community - FAQ: Menewsha Site Rules
Double-posting means you made two (or more) posts directly following each other. So in other words, to cut down on spam we ask that people wait until someone else replies before they make a new post. If no one has posted in 5 hours, you
can make a reply as long as it's on-topic. :yes:
If you really need to add more information to your post, just hit the "Edit" button, and you can add information without needing to post a new reply.
Does that answer your question? :)
----
EDIT: Well, it looks like you know how to edit, so you're already doing good! :D There are several ways to subscribe to threads. This post explains them in detail:
http://www.menewsha.com/forum/main/i...ml#post3011644