Our website text boxes won't recognize special characters, so you can omit the symbol or write the word "degrees" or "deg". Either way, we always make sure the degrees symbol is in the proper place.
But for future reference:
On an iPhone or iPad, tap and hold on the zero key, and you'll be presented with a little key pop-up that gives you the option. Just slide your finger over to the left until the degree symbol is highlighted, then let go.
On a Mac, hold the Option key and type K.
On a PC, hold the Alt key and type 0176.