Install "1Pilot remote manager" plugin on your website
Once installed, go to Settings, 1Pilot Settings and copy the private key
Go to your 1Pilot Dashboard and click add new site
Fill out the required fields and paste the private key
If your server is not at time you can have issue to connect your application to 1Pilot. For solve that go to 1Pilot Settings on the OctoberCMS backend of your site and check "Skip timestamp validation".
Please note that this option will decrease security and that you should as much as possible set your server at the correct time.