No worries; we're all here to help each other.
I use
Imgur for all of my hosting needs, as they are free, host your images without changing their size or quality, and can store 240 or so of your images at any given time. Another Site you could check out is
Majhost, another free image hosting Site.
To use them, you simply make your image, make an account on the Site, and upload the image. When you're done uploading the image, simply copy the image's URL (which you can do by right-clicking on the uploaded image and clicking "copy image URL") and then pasting it into your profile page, under the "Signature" area.
EDIT: Here's a handy post with images illustrating how to do this.