https://support.office.com/en-us/article/share-a-contacts-folder-with-others-ce5a40d1-bc9f-4f5d-a2aa-5ec388573821

You must be a Company Admin to access our CloudPanel control panel!

To add a contact to the Global Address List (GAL) that all users can see:

Log into CloudPanel using the appropriate credentials.

Then:

Exchange → Contacts → Add New