You can just mail it to the CFF and indicate it's to go toward your team.
I usually turn all the checks in at the end, on walk day. Any checks that arrive afterwards, I mail to the attention of our CFF rep and indicate it's to go toward our team. Then the bigger checks -- over $75 will show up on our website with who donated, smaller donations end up on the site, but jut with total amount under a listing of checks under $75.