Set exercises for your students to complete
When you want to tell your students which exercises to complete, let them have a url (‘link’, ‘web address’) for an exercise set, or a specific lecture or unit, or even for a specific exercise.
The link to share is just the link in the address bar of your browser when you are looking at the page you want your students to see.
If you have a course page, you can include links to exercises on zoxiy in the same way you include links to handouts and other materials.