All of the team properties on your account can be adjusted via the admin portal. This includes your team name, nickname, abbreviation, logo, city, state, and even color scheme. To adjust this info, click the Account Details option as seen below.
Once on the Account Details page, you will be able to adjust your team's info as you'd like by hitting the Edit Account option in the upper right-hand corner.
If you know the specific hex, RGB, or HSL code of your team or school, you'll be able to easily enter that in the color section. You can toggle between those options by clicking on the up/down arrows below the color slider. You can upload an image to use as your logo here, too. After selecting an image file, make sure to hit the Upload button to have it load online.
Once you are done adjusting all of your team's properties, hit the Save button in the upper-right hand corner, where the Edit button was prior to editing the information. To see the changes reflected in the account, you will need to log out and then log back in.