Many people have had problems with adding thier signatures. But it's very easy to solve. Do NOT, write IMG, write img with small letters. Simple but important.
Tho, try to keep the sig size under 100kb (to nnot slow the forum down so much). And also, try to keep em in maximum 500x150 px.
We will not ban, delete you for stupid stuffs like this. But if we see a problem we will PM you aboutt it. Have fun sigging.
EDIT: If you got any problems, just msg me or somone else and we'll see what we can do. Always feel free to drop me a PM or xfire me.