I want a sign under my POST. How do I make one?

I see all these signs.

Hope this helps a little :
1st … Size your pic ( 480 x 114 ) Max I believe
2nd… Go into " My settings"
3rd … Click on " Signature"
4th … Click on the the little box with what looks like a little mountain in it
Then its just cut and paste.
There is a link how to do it in the forums also. I’m sure someone can direct you to it.

You mean a signature right? (Something that appears automatically at the bottom of every post you make). If so - read THIS thread by Max - in particular the section titled HOW TO: POSTING, the signature info is the forst section under that heading.