Signing in
There is no password. You ask for a code, it arrives, you type it in.
The sign-in screen has one box that takes either your email address or your phone number. Enter whichever your coach has for you. A code comes back, eight digits, and that gets you in. If nothing arrives, the address you typed is probably not the one on the roster. Ask a coach to check what they have for you.
Use your email address for now. Text codes are built, but the phone number this site texts from failed the carrier's registration check and nobody has resubmitted it yet, so a code sent to a phone goes nowhere. That is ours to sort out. Email works today.
Signing in lasts about three months on that phone, so most athletes do this once a season and forget about it. It is per device, so a new phone means a new code. Once you are in, sign out sits in the bar at the top of every screen.