What version of Premiere Elements and what computer operating system is involved?
Where have you put together this video and edited it, and how did you upload that content to YouTube
a. Using Premiere Elements build in YouTube feature
b. Upload of a file from the computer hard drive to YouTube at the YouTube web site?
Generalizing...if Premiere Elements 13/13.1 export to file for the upload to YouTube at the YouTube web site...
with Presets = MP4 H.264 1920 x 1080p30 or YouTube Widescreen HD.
Please give details so that we can give you a custom reply.