You can add a hyperlink on any letter in the content editor. Select a word or a paragraph and click on the chain button in the content editor tools above. It will open a new text entry where you can type in the URL of a website. Press ENTER to commit this change.
Note that you can also reference values in hyperlinks. You could append a value at the end of a URL which would lead to a certain subpage or you could reference a whole URL from a textblock which will be chosen, depending on how the user traverses the module.