Adding a Button on Toolbar to Email a Topic URL

I know this has been discussed a few times but I had trouble finding the solution to my question. If it has been answered kindly send me the link to the solution. I am using Robohelp2019 and am wanting to add a button that will email the URL link to a topic page. I've tried solutions that return either the name of the htm document or gives the path to the document on the server. I am wanting a link to the URL where the recipient can click and be directed to that particular page of the manual.

Thanks for your help.