To assign a service to your client, you must first setup your services. Please check out this article for more information: Setting up your services
Select Clients on the left-hand tool bar.
On the client list, select the client for which you will be updating their services.
Click Add a service/package.
You can select one or multiple services for the client.
Click SAVE
You will now be looking at the client's profile and the selected services will be displayed.
The services will also be listed on the client list.