Is there a non-binary option for gender?
Sadly there is not and to go along with that I can't add one ):  I really dislike that it isn't there but, it's not something I can change. However, under your profile settings there's a box on your bio for you to add your name and preferred pronouns! Make sure to fill that out! 
Can I change my username?
I get asked this a lot. So there's a yes and no. If you have a valid email connected to your account then yes. You can ask an admin to change your username for you! When they do this, your username will change and you will receive a new autogenerated password that will be emailed to you. You can then use this to get back into your account and change your password back to whatever you'd like. Please please please don't ask to do this more than once about every 3 months. If you don't have a valid email hooked to your account, please connect one and then request a change with an admin. A list of admins is posted under the home tab! Any of them or even myself would be glad to help you!