To link your imprint to your navigation bar, simply go to "Navigation" in your magazines "settings“ and add the link to your imprint ("Imprint Link"). If the imprint is part of your magazine you don't need to put in the complete link but only the name of the article (e.g. imprint). Also type or copy in text that you would like to be displayed with the link ("Imprint Text").

The imprint then will be displayed by a symbol in your navigation bar. This also allows readers to reach your imprint within your magazine at any time with just a single click - which is also mandatory according to the GDPR. 

Read more information on the subject of GDPR and digital magazines here: https://en.webmag.io/blog/gdpr-digital-magazines