How Do We Replace an Action Button Midway Through Our Show?

We have an ACTION button on our screen with TEXT. Clicking this sends our audience to another web page. But MIDWAY through the showing of our photo gallery, we want to make that button GO AWAY and replace it with A NEW button with different text and a DIFFERENT ACTION. Is this possible?  We can't read or write JavaScript.  We have version 2015 on a MAC.

Thanks!

Bob