Add signature to my posts?

is this the official. i was looking for the sig button and searched and found this thread. yet? :)
You're all set up!
I have one uploaded but it's not showing in my posts??? It appears to meet the size limits. Sorry for the noob questions.;)
Yeah, you need to keep the size (both dimension and file limit, if you are using the attachments feature to host the image) down to a manageable limit.
 
071-1.gif
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is there a reason why they wont let me add this as my signature it's 290 x 125