To add a Publisher to the replication monitor, follow these steps:
1. Open the replication monitor in SQL Server Management Studio (SSMS).
2. Select the group under which the Publisher should be added.
3. Right-click on the group and choose "Add Publisher" from the options.
4. Provide the necessary information, such as the server name and database details, for the Publisher.
5. Click on "OK" to add the Publisher to the replication monitor.