ok Lauren hon.. here we go.
- Your ISP will have provided you upload space. Who is your ISP? You can go to their home page and there will almost certainly be a 'support' section. Thru this support section you 'should' be able to find information on how to access your webspace. The most common way of doing this is using something called FTP.
Now FTP is sort of simillar to windows explorer, but it allows you to move data (your pics for your avatar and -sig, for example) from your HD to your webspace.
TRUST ME when I say FTP is easy to learn to use, because I did it only last week. If I can learn how to use it, anyone can!! I am sure yo uare MUCH smarter than me!
- Once the pics you want to upload for your avatar and -sig are in your webspace you will need to link to them from your "My Controls" pages at the top of this page. See it up there at the top in the same little frames bit as your login name?
In there you will find an imput cell where you type in the address of the avatar. It will be something like.
yourUsername.yourISP.com/picsDirectory/Avatar.jpg or some ISPs use a slightle different layout such as
yourISP.com/~YourUsername/PicsDirectory/Avatar.jpg something simillar to that anyway. By the time you have worked out FTP you will know just what to type anyway, so all is good

That is really ALL there is to it!! It really is as loubear mentioned, simple once you know how.. and learning how is something even I could do so you should have no trouble.
So, its..
1) Find out from your ISP how to access your webspace on their server.
2) Upload your avatar.jpg (and also sig.jpg if you wish) to your webspace, usually using FTP.
3) type the address of the avatar (and sig if yo uhave one) into the correct cells under your "My Controls" section at the top of this page.
If you are still having troubles, then I am SURE that ANY of us would be only too happy to talk you thru this process step by step in an IM or pm etc. But I have faith in you mate! I know you can do it!
