Edit a publication
You can edit a publication using the Sitecore Content Publisher editor, which you can open by clicking Edit 
either on the Publications page or on the inline preview of the publication.
The editor page has three tabs: Design, Frames, and Details.
The Design tab lets you edit variables, which are the text elements of your publication. Variables can be simple or conditional. The number and type of variables depend on your template configuration, and any modifications will be displayed immediately in the publication.