1. Go to User CP at the top of the screen.
2. Look for ' Edit Signature ' on the left side of the screen.
3. Click 'Browse' and choose your signature.
4. After you choose your signature, it should pop up and under the picture click 'Insert Image'.
5. Then go to the bottom of the screen and click 'Save Signature'.
If that doesn't work, PM me and I will give you more detailed instructions.