Here is a quick overview of the client management:
If you want to add a new client to the portal you can go to Clients > Create client.
Your client will then receive details to login to your client portal.
Here is what you can see and edit for your clients:
Add team name
Assign account manager
Add files to storage
Cancel their subscriptions (immediately or at end of subscription period)
See all their requests
See their last logged in date
See their reviews