The options for adding SQL Server instances is very similar to SQL Server.
Server address: [Host]\[Instance]:[Port]
Server type: Choose server version, although this will be automatically set during the first connection.
Network protocol: TCP\IP or local options of Named Instance & Shared Memory
Authentication: Windows or SQL Server
Test Connection: This will test the connection and automatically set the server type should it differ.
Friendly name: Give your instance a friendly name.
Tag(s): It's possible to group your instances into several tags (See Tag management).
Color: Identity your servers more easily by using colors.