Why won't my signature work?

[Darksith]

I am attempting to put in a signature (not my avatar). The file I am using is only 9kb, the size of the signature is 252x100, so it is the correct size. What is wrong? Any techs around? It shows up when I go into edit my signature, but it won't show up on my posts.

[Darksith]

test test test

[Darksith]

testicles testicles

[Darksith]

damn Im smart