This option is available if you enabled the Organize&Search feature package
1) Open the Webtop.com app
2) Open the link/URL in your web browser
3) Navigate to the installed plugins section in the top right corner of your browser and click the Webtop.com browser extension, then click the "Save link" button
4) Select which workspace and desktop this link will be added to, change the title if required and click the "Save" button on the top right.