How to enable paste on click
By default, you click an item to select it and double-click it to paste it. You can make ClipBook paste an item with a single click instead.
To enable it, go to Settings → History and enable Paste on single click.
When this option is enabled, ClipBook selects the item under the mouse pointer, and pastes it when you click it.
To choose what double-clicking an item does, go to Settings → History and choose Paste or Copy in Double-click action.