There are two ways to accept items shared by an Outside Team Member:
 
1. Click the bell icon on the top right side of your account. This will show you a list of all the recent items shared with you. You can click on any of the shared items and be taken to a screen to accept or deny them. 
2. From the Gear icon on the top right, click Outside Team. You can then navigate to the Received tab, which will show Appointments, Checklist Templates, Contacts, and more. To accept these, click on the ellipses on the right-hand side of the card and then choose to accept from the menu.