It's easy to switch between the front and back end of your Zerista site.
First, log into the site (https://yoursitenamehere.zerista.com in most cases) using your personal username and password. This will load the front end of the site.
To load admin (back-end), just put /admin at the end of your front-end url.
Once you're logged into admin, you may need to switch back into the front end quickly. For that, click on the square conference icon found in the upper left corner of the screen, above the left-hand navigation bar, as seen below. This will open up the front-end site in a new tab.