No problem. Did you check where it says to 'insert signature pic'? It's like a two part process do put your signature in your profile. Cause it should let you know if the signature size is too large.

If you want to post a pic in a thread, click the icon that says 'Insert Image' when you put your cursor over it. And if you want to do a You Tube video clip, click the You Tube Icon, and embed the info inbetween the tags.