Issue with converting number to time

I have tried to advance by vba skills with a new project: Time Management.
I have several issues with this spreadsheet. However, the one I am hoping to have guidance on is how to select the "Duration" time value in the userform and get it to show correctly. Currently, when I select 1:00 (i.e. 1 hour) it is showing as "0:00".


Disclaimer: this worksheet is based on the videos by Randy (https://www.youtube.com/watch?v=8-IEk-pmfco. I worked on this worksheet from scratch and was doing well until the 3rd video. I have watched the videos many times but I now am stumped. If this goes against the forum rules by working off a 3rd party project, please let me know and I will delete.