Elements 10: Still images for youtube not fitting 1920x1080

I am posting beats I make on youtube and using a couple of images for the video while the beat plays.

I am exporting my project settings 1080x1920 (mp4), and using 1080x1920 images for my Youtube videos. The images are not fitting to the Youtube video correctly.

Here are my videos:

FREE RAPS BEATS - 3 Free Hip Hop Instrumentals for Download - YouTube

Pharrel Type Beat - The Weeknd Style Rap Instrumental by Colin Anthony - YouTube

Here is an example of what I want:

50 BARS - Old School Rap Beat Hip-hop Instrumentals 2015 - YouTube

*SOLD* Drake Type Beat 2015 "DEEP" (Prod. CJ Beatz Productions) - YouTube

I tried Edit>Project Settings>Video and the Video size part is grayed out. Any ideas? Please help!