I found,only when you first login can trigger auth request,and granting for your originations for approve.
but,if you want to grant more originations after that,you must go to your github developer settings,and revoke all tokens for drone app,then,logout drone dashboard,and login again,then you can choose grant more origination.
There should be a operation in drone dashboard somewhere,re-grant,and no need do above steps.
this is not quite accurate. you do not need to revoke all tokens or even logout … you can grant access to additional organizations in the github settings (as described in Organization repositories not showing up in GitHub) and then you can click the re-sync button in drone.