Yes, if you are the owner/admin of the website, you can easily and freely moderate this by going to your website's Gallery.
You can go to your website > and click on the Gallery page, then when you edit a specific gallery, you should see the button "Edit Gallery",
like what you can see on this image:http://prntscr.com/dhz36a
If you click that, you can now edit and moderate that specific gallery.
I hope this solves your problem.
Just contact us if you have further questions.