Select the ready-to-use profile named 'Capture screenshots on regular intervals'. If such profile does not exist then select a capture profile that has the screen as capture source and after that run the 'Task Wizard' and check 'Grab/Upload capture' to be the task you want to execute and check the 'Grab/Upload Settings' option.

On the 'Grab/Upload Settings' dialog you will change the time interval you want to capture screenshots and check the 'only capture images' option.

The capture window will be showing the contents of the Desktop.

To start grabbing click on the start button on the 'Grab/Upload Action Toolbar' or on the same option on the 'Grab/Upload Action Menu'.

You can also schedule when to start grabbing. To set a schedule use the scheduler at the 'Grab/Upload Settings' dialog.

To stop grabbing click on the stop button on the 'Grab/Upload Action Toolbar', or on the same option on the 'Grab/Upload Action Menu'.

At the preset interval a snapshot will be grabbed and will instantly appear on the 'Grab/Upload File List'.

Open the 'File Menu' or right-click on the just generated file to learn what you can do with the snapshot file.