You should ask your club for the Connect to Play code of the account you wish to deactivate.
See here how the club can send you this code: Join Player Accounts
Once you have the code, follow the steps below.
1. Open the main menu by tapping the three lines (☰) in the upper-left corner.
2. Tap “Settings.”
3. Select “Settings” again.
4. Enter the account code you want to deactivate and tap “Confirm.”
Important: You must log in to the account you wish to keep active going forward.