SuperAdmin can reset passwords for other users.
If SuperAdmin cannot do that for a reason (cannot login to Management Console as well or is away):
Stop “Resilio Connect Server” service
Open elevated Command Prompt and navigate to C:\Program Files\Resilio Connect Server
Run command srvctrl.cmd resetpassword <username>. Copy the link in the output.
Start “Resilio Connect Server” service and go by the link suggested in command output.
Enter new password.
Stop Management Console with
./srvctrl stop command
Reset password with
./srvctrl resetpassword <username>
Start server with
./srvctrl start and open the link from command output
If you don't remember the username, you can create new user with same command:
when prompted, agree to create new user and then follow the instruction. By default this user will get SuperAdmin rights.