While creating your campaign you can tag subscribers who will click a link once campaign is sent.
To add this option , just follow the easy steps below:
Create your campaign and complete the first steps
Selected a template and customize it in drag drop editor then save
Once saved click on the button: "Tag subscribers who click this link" then click on "Add tag"
Choose one the links "URLs" in the dropdown and the tag you want to add to subscribers who clicked this link
Note : if you have multiple links "Urls" in your content and you want to add different tag to each, you need just to click on "Add tag" , select an Url and a tag
Click on save and continue