First off, this is in the wrong section. This needs to be in 'Site+Forum Help'
Second off, here's a quote to help you.^^
Signature
For signatures we will be doing almost the same steps but will be using a different link this time. We will be using the IMG coding this time.
(http://i1299.photobucket.com/albums/ag69/Youshallfearme2/19fb9805-b00e-44f0-bd5c-600a6577b899_zps5dda90a5.jpg)
Go back to your file sharing site and find this link. It should be a IMG link if not then chances are it wont work to well. After that fallow the same steps as the Avatar by going into the Forum Profile Information and this time, go in your signature box.
(http://i1299.photobucket.com/albums/ag69/Youshallfearme2/2f2888e5-1467-46e5-9799-62d03fb6bf12_zps392e675d.jpg)
After you click that then it will give you options such as "Signature" which is what you want. From there you just input the IMG coding you have gotten and then save it. In a few minutes or so you will have a signature.
(http://i1299.photobucket.com/albums/ag69/Youshallfearme2/a5d97274-8dec-4bb4-8654-145472751911_zps977f883b.jpg)
And If you've done all the steps correctly then you have successfully uploaded a prefect signature. Now just a note that0 there is a size limit to this as well, you are able to see how much space you have left when you look at the number grid underneath the signature box. You can upload jpg, and gifs in the signature box as far as I know of.
With all this said, this ends the tutorial on Adding a signature to your profile.
For more further questions fell free to shot me a PM and I will try my best to help out. I do hope you find this small tutorial helpful for some of you younger members out there getting used to the forum setting.