At least I can help loading a picture - with pictures!

Link to edit or add a signature
1 sig edit.jpg

Click BROWSE and select your image on your computer
2 sig browse.jpg

When the image is loaded, click UPLOAD
3 sig upload.jpg

In EDIT SIGNATURE, add type and other Blab stuff. Click PREVIEW SIGNATURE to see how it will appear in the PREVIEW window on top is. When you are satisfied, click SAVE SIGNATURE.
4 sig save.jpg