Client Portal/OLR gives you options to configure how you'll allow your clients to register and create appointments. You'll want to view and set any necessary settings for your business before deploying the Client Portal.
From the Live Access side, click on Online Reservations. Then choose "Use & Registration" and you'll see the Online Reservation Settings page displayed on the right.
These are general/main settings and should be configured before use of OLR.
If you're looking for information on how to on-board your customers to Client Portal, please visit this link: Onboarding your customers to Client Portal/OLR