Once you have the Publication created, you can start customizing your Publication.
To do this:
Click on your profile icon top right of screen
Click on My profile
On the left-hand menu you will see Publications
Select your Publication
Alternatively click on your avatar icon top right of screen and simply click your Publication's name
Select Edit Publication
Editing a Publication
There are multiple things you can customize in your Publication:
Upload header image (preferably landscape orientation). This will be displayed at the top of your landing (home) page. It will also display on each category page (with a reduced height).
Add title. This will be overlayed on your header image.
Add a sub-title. This will be overlayed on your header image.
Add a short description. This will be displayed on the left-hand side panel underneath your avatar.