Youngmummy,photos.Click on your profile.Then My Forum.Then signature.At the top of the signature box is a little tree symbol.Click that.Choose where you want your photos from.Browse and upload the ones you want.When you're done press update.
You need to make photos small enough,use a resizing programWindows has a free one,just go on windows power tools(think it's called that).It can make your photo blurry so I use another way in that case,I email a photo from one of our emails to another,down load that picture and use that,it's the right size,and it doesn't blur your photo.
Hope that helps.There are instructions somewhere on the site,I'm sure.