The connections to the various database tables used by the region are configured here. These connection strings are put into the azure package, and are also appended to the machine.config so access to the databases can be done from the command line tooling.
Click Add to add a new database connection string, or the Delete icon next to the row to delete a connection string.
The connection string is similar to the following:
Server=tcp:[servername].database.windows.net; Database=master; User ID=[username]@[servername]; Password=[userpassword]; Trusted_Connection=False; Encrypt=True;where:
The connection string for each of your SQL Azure databases has the same format, but with master replaced by the appropriate database name.