Connect to Existing Secondary Replicas Page - Always On availability groups
Applies to: 
SQL Server
This help topic describes the options of the Connect to Existing Secondary Replicas page. This topic is used by the Add Replica to Availability Group Wizard and Add Database to Availability Group Wizard of SQL Server.
Grid columns:
Server Instance
Displays the name of the server instance that will host the availability replica.
Connected As
Displays the account that is connected to the server instance, once the connection has been established. If this column displays "Not Connected" for a given server instance, you will need to click either the Connect or Connect All button.
Connect
Click if this server instance is running under a different account than other server instances to which you need to connect.
Connect All
Click only if every instance of SQL Server to which you need to connect is running as a service in the same user account.
Cancel
Click to cancel the wizard. On the Connect to Existing Secondary Replica page, cancelling the wizard cause it to exit without performing any actions.
Related Tasks
Use the Add Replica to Availability Group Wizard (SQL Server Management Studio)
Use the Add Database to Availability Group Wizard (SQL Server Management Studio)