You cannot configure tasks on the server without the client running (for file browsing). When you run the client installer this will pop-up when the installer completes. If you need to change any of these settings later there will be a shortcut in the start menu to lauch the setup application again.

Fill in the connection settings and click Generate to paid the client with the server. This will stop the client service if it is present (install it if not). Please note this will interrupt any active transfers. This will popup a window like the one below.

The identity that it shows you must be copied from this box as you will need it when adding the client on the server. Once you have copied the identity, click ok and then click either ok or apply on the first window.