Easiest way is to highlight and drag text to desktop as only so many messages are kept on the server. Or if you want the whole thread, just use "save as" a Web Archive.
Lol...my bad, if you know in advance you are going to want to come back to a thread, go to the top of the thread. Select Thread Tools => Subscribe to thread. Then in the future you can click on Quick Links => Subscribed Threads to find the thread.
Your animated sig/avatar has to fit within the guidelines.
The rules are simple when it comes to sizes of avatars and other uploaded pics.
I got this message:
"You may not upload animated avatars"
Wouldn't have a clue why....Never tried before. Do a forum search on this and if nothing comes up, start a new thread asking about it.