Directions:
1: left click on it and choose "save image as..."
2: name it whatever you want.
3: resize it to 75x75.
4: go to your profile on blockland forums.
5: go to like where your avatar settings are.
6: edit the avatar to the image.
7: if you need to, get like a file format changer program or something like that and change it to gif (i think).
8: enjoy!
(im not sure if thats right or not. Please blame it on me if doesnt work)
Your welcome!