Multiple Photos in Same Frame for Slideshow

Hi. I've figured out how to remove the black borders on a single photo. However, I'm working on a slideshow which has 2 still photos on the same frame. When I do 2 photos, I can't figure out how to remove the black borders, which means both photos are centered/overlapped in the middle and there's an excess of black border on both sides. Can someone help me figure out how to put the photos side by side and take up as much room of the frame as possible? It's urgent - it's for our wedding next week!

Thank you!!

--Natalie