The procedure for adding a link to the button is as follows:
1. Edit your slide
2. Select the button
3. When the button is selected, open the “Action” tab.
4. Click on the “+” sign to add the action
5. From the next drop-down box chose “Click”, then “Simple link”
6. Insert the URL in the next text field.
7. From the following drop-down list Select whether you want the link to open on the same or new page.
8. Save the slide