61k is not too large. How are you uploading the picture? I just played with mine, and nowhere did I see an"accept" button. I'm wondering if you're in the right place.
Click on Settings (at the top right of the page). Then on the left, scroll down until you see "edit profile picture". I'm assuming you're uploading a pic from your computer? So select option 2, click "browse", which will allow you to select which pic you want to use from those on your computer. Double-click on the picture you want, then "Save changes". That should work.