First of all, obtain your token which was sent to your emails.
That is an authentication token for checksystem API & our cloud.

Cloud console, how to:
1. Go to https://cloud.ructf.org ;
2. Input your token ;
3. Enter command "help" & follow the instructions.

Checksystem, how to:
1. https://monitor.ructf.org ;
2. Flag lifetime = 15 mins (remember, flags should live after dinner time!);
3. Round time = 1 mins ;
4. Checksystem API available here also.