To get the link (URL) you want to share, right click on it, then select "copy link address" or the like. A different way to get the URL is to visit the page you want linked to, then copy the URL from the address bar of your browser.
To share the link (URL) in an email, simply paste it. To share the link in a hub, open the editor, type the text as you want it to appear, and highlight that. Click on the linking (chain) icon, and paste in the URL in the box that pops up. Save the changes, and you are done.