Adding a hyperlink to an element works as follows:
In the canvas, double-click the element you want to add the hyperlink to (the image, button, shape, video, etc). The propery panel will now open. In Actions, click the VIEW button next to On Mouse Click. Select 'ADD KEYFRAME'. Select 'ADD ACTION'. Optionally, under Time you can enter a time when you want the action to happen. When adding a hyperlink, Time will usually be set to 00:00:00. Select 'Navigate to URL' If desired, you can give the action a name (optional). Enter the URL you want to link to. Klick on 'Confirm'. The hyperlink is now added and automatically opens in a new tab.