Avatar: Under My Settings - forum settings. There is a spot to paste a URL to a pic that fits the requirements ie.. correct pixel size.. It has to be exactly 50 by 50 pixels. Most likely you will need to find a pic.. edit it so it matches those dimensions ( I just use MS Paint).. and put it somewhere you can host files on the internet).
For the profile - same logic.. except the phot has to be 100 x 150 pixels, and this is set under My Settings - Profile Settings
MIODude
It's not as complicated as it sounds. As long as your picure is fairly square, one of these things should work:
If the picure is on the internet just drag it to your address bar and you should end up with it on a page by it's self. Then just copy and paste it onto my settings<my forum settings.
Or drag the picure to your desktop then go to imageshack.us to host it. Copy and paste the link marked, "Here is your direct link" onto my settings<my forum settings in the designated place.