There are two ways to add a gallery to the page:
1) If the gallery is owned by the group that owns the page
For example if you’re adding a gallery owned by Core: About group to the About page.
Edit the page and click Add —> Slideshow in the LiveWhale toolbar:
2) Or, if the gallery you want to add is in another group
First go to the galleries manager, select Get Code next to the gallery, and copy the widget code:
Edit the page, and click the Source Code button in the toolbar.
Paste the widget code into the source code editor: