You can upgrade to the Image Signature Subscription at http://www.warriorforum.com/payments.php
The price for the Image Signature is $60 per year, which is only $5 per month.
As soon as you have upgraded your account, you can add an image to your signature using the steps below.
How to add and upload an image to your Warrior Forum signature:
1) Login to your Forum Account
2) Click on UserCP (User Control Panel)
3) Click on Edit Signature
4) Add [SIGPIC][/SIGPIC] in the Signature Form
5) Upload the Signature Image
.PNG / .JPG Format
To make sure your signature appears on posts:
Please check your UserCP Options Page at http://www.warriorforum.com/profile.php?do=editoptions to make sure you have enabled Signatures in the Thread Display Options section.
When you make a post you have to check "Show Signature" ticked to show your signature.