Here's what I did to add a pic to the signature line for testing purposes:
1.) Get a free online storage account. I use www.myonlineimages.com, and it takes a snap to register.
2.) Once registered, login to your account, and click "Add Images".
3.) Start uploading images. You can upload 10 images at a time.
4.) Once you do that, you will see thumbnails of the images you just uploaded. Just click on the image that you want to be added to your signature line. You will then see a label which says "Image URL:", and beside it will be the URL address eg: http://www.MyOnlineImages.com/Members/USERNAME/images/IMAGE-NAME.jpg. The link I am providing is just an example, so it won't work. Copy down the URL exactly.
5.) In massageplanet.net, go to "User CP", then "Edit Signature".
6.) Copy down the Image URL into the white box, and then type
at the end of the URL eg:
7.) Click "Save Signature" and that should do it.