Hi shepard_3 - welcome to the game, to the forum and if you are wise, to MP as soon as you can!
I went to picfront and opened the piccy. It is enormous! I copied the
picture location and pasted it in this reply, adding the tags

after and when I previewed my post your piccy appeared full size for about 15 seconds and then disappeared! Basically it is way tooooo big I think for the display rules of the forum
I suggest you edit it down to the actual size you want to appear in your signature and post that on picfront and follow the method above to get it into your signature.
This is it reduced to 6 inches wide rather than the original 3 feet!
I suspect that you made a high res original which when it is translated to 96 dpi, being 3000+ pixels wide is expanded enormously!
