To add a link, click the Links button on the Links group of the Insert tab. Then, highlight the area on the PDF where you want the link to be inserted. At the mouse up event, the Add Action dialog box appears, where you can set a link action :
The following actions are available:
If you want to set the Open Web Page link action, the Edit Web Link dialog box appears:
Enter the URL as required.
You can edit link properties with the help of the Properties panel. Make sure the Edit mode is ON, select the link, then open the Properties panel:
The Link-Annotation function is applicable only when Insert Module is activated.