Here's how!

You will need a www.photobucket.com account. It is free to sign up, you can upload your pictures, videos, animations, etc there. Then all you need to do is copy and paste the IMG code that they convienently have there for you!

If not(or its too confusing) you can attach a picture from your own computer. When you reply there is a blank box that says:

Attach File:
Maximum size: 2100000 bytes

there you will also see a browse button, which allows you to look and choose which picture you want.

Hope that helped! GOOD LUCK!

Also, for the signature, you may also want to post which you want for each individual siggy, mine and Michelle's (kittycats_delight). For example, colours, names, sayings, icons(paw or heart), etc.