The Zendesk integration needs to be set up both in Membrain, as well as in Zendesk.
By using the Membrain menu and going to the "Admin" page (only visible for users with administrative priviliges) you can reach the "Integrations" tab where the Zendesk integration can be found if it's enabled for your organization in Membrain.
On this page you will find some easy to follow instructions on how to set the integration up in both products.
If you can't see this integration option, or you come across anything that is not covered by these instructions. Email firstname.lastname@example.org or use the megaphone in the Membrain menu and we will respond as fast as possible to help.