you are so stupid, Cuda just explained the whole thing perfectly. and since you cant understand i shall try to explain it to you.
1) find the picture that you want
2) open up the paint program (called "paint). to find it click your start button, then roll over all programs move up to the bar called accessories and another line of bars will appear. find the paint program and open it
3)load the picture you wish to use as your avatar.
4)use the paint tools to edit the picture so it has a width of 75 and a hieght of 75
5) save that picture
6) go to the blockland forums and open up your profile page
7)open the link in the box to the right of your profile info. (the one that says "forum profile information")
8) click the button at the top that says "i will upload my own picture" and then click the browse button underneath .
9) cycle through your documents until you find the picture you saved in step 5. upload the picture.
10)use the blockland pictures with your new lovely avatar and be merry.