Adding a client is in two parts. We fist add a client on studio 48 then choose a site (in this case your marketplace) and add the client on that site as well.
After login, on the left panel, click Users and choose Add New;

Enter clients details i.e Username, Email, First Name, Last Name and Website if available.

On the password field, you can use either of the following:


Check Send User Notification box.
Under User Roles, check client box. Check all details are correct and click Add New User.

You will get a new User Created notification and User will be on the list.
