Subscribers can directly subscribe by clicking on the 'Subscribe' button in the public status page. But, If you want to add the subscriber manually, follow the below steps:

Navigate to manage subscriber settings:

1. Click on the Settings icon on the left side menu bar.
2. Click on "Manage Subscribers" under User Management
3. Click on the "+New" button present on the right of the page
4. Enter the E-mail of your subscriber
5. Toggle the "Send subscriber verification Email" to skip the verification Email
6. Select the services which have to be associated with the subscriber
7. Click on "Save" button to add the subscribers