Let me explain how u can add your signature in 3 steps.
First click on 'Profile', then on the tab 'Preferences'
- Always attach my signature : check the option YES
now click on the tab 'Signature'.
- there use the custom IMG tags with the url to your pic/sig in between.
example : [IMG ]https://2img.net/r/ihimizer/mysig.jpg[/img ]
note : u must close the tags right after IMG