If you want to login to your multiple sites at once, you can use "Bulk Login As" feature. 

This feature is accessible from your iControlWP dashboard, under the Bulk Actions section.

To login as admin to your multiple sites, simply specify sites or site groups and then confirm your iControlWP account authentication by entering your password or PIN.

Note: If you can't login as admin to multiple sites, please ensure that you allow popups or remove popup blockers for iControlWP app.