If you've run across the phrases, "publish your gallery to add a client”, or “publish your gallery to add it to your Gallery Directory", that simply means the gallery is not viewable.
Here's the steps to publishing your gallery:
Step 1: Go to Your Gallery
From your dashboard, go to the gallery you want to publish. In the top right-hand corner, you will see a button that says either Hidden or Published.
If it says Hidden, that means the gallery won't be visible.
Step 2: Publish Your Gallery
Click the Hidden button to publish your gallery.
The button should now be green and say Published, making your gallery viewable.