You can provide access of OnGrid portal to your other team members following the mentioned steps:
Log into OnGrid's portal using your credentials and select the community where you want to add the user.
Click on the "Users" tab in the left navigation panel.
In the top right corner of the screen, click on the icon to add a user.
Enter the user's email address and select a user role from the three options: Administrator, Manager, and Executive.
Click on the "Send Invite" button to grant the user access to the portal.