Here's a video that may help you- How to make a client active or you can also use the following instructions to solve the issue.
1. Click "Clients" on the left menu and then go to "First Name" and click the filter icon to the right of it.
2. Create a search and then go to the top right and click the check box "Inactive Clients."
3. After that, find the search result you were looking for then click the first name.
4. Once you have reached the client's profile, click the "pencil icon," on the top right corner. Once the client profile screen shows,
go to "Status" and change "Inactive" to "active", after click "Save" and then exit.