Hello @nateh30gmail-com,

First of all, we would like to apologize for the delay in replying to you.

In the graduate pro theme, the slider can be set by choosing post, page, category. If you choose the options page then to change the slider image you have to go to individual page edit screen change the image in the featured image section.

Screenshot:

https://image.prntscr.com/image/eM3W7nW1SXC1C-rrNVYPbA.png

Similarly, in case of post and category, you need to go to individual post edit screen to change the image.

https://image.prntscr.com/image/08ELjsS1SJq7j0NJO-5jOA.png

Hope this helps.

Let us know if you have any confusion further.

Best Regards!!

Have a good day 🙂 .