Here is how to change the size of an image in Photoshop:

1. Open photoshop.
2. File > Open. A box pops up, where you can find your image and select it. Press OK and the image will now be opened in Photoshop.



3. Go to Image > Image Size.... A window pops up where you can edit the height and width of the image. Make sure "Constrain Proportions" is checked at the bottom of the window.

4. Under "Pixel Dimensions" is the width and height you will be changing. Make sure "pixels" is selected next to both the width and height. The maximum height and width for your avatar cannot exceed 85 by 85 pixels. Therefore, you need to put 85 in the width. Notice the height will also change accordingly to the proportions. **If the height comes to a number above 85, this means you need to put 85 as the height and the width will have to be less**



5. Once both width and height under "Pixel Dimensions" (don't mess with document size) are at or below 85, press OK. Save your file and now you can use it as your avatar.