For Service:

1. Go to Settings > Services.
2. Open a recurring service and go to the Clients tab.
3. Click on the +Assign to Clients button.
4. Choose the clients and save.
5. The service will be assigned to the selected clients.

For Package:

1. Go to Settings > Package.
2. Click on the package name and go to the Clients tab.
3. Click on the +Assign to Clients button.
4. Choose the clients and save.
5. The package will be assigned to the selected clients.