From Halopedia, the Halo wiki
- To upload an Avatar for your profile:
- Step 1: Save the selected image to your Computer.
- Step 2: Click "Upload" (the link is underneath your pre-avatar image).
- Step 3: Click Browse, and select the file of the image you want to upload.
- Step 4: Hit OK.
- Step 5: Congrats! Enjoy your new avatar.
Note: Please make your avatar appropriate.