Hi Devon,
In the create button, select the training event entity and select the new edit page of the same. Change your data source to database from X path. Please follow the image.
Hey!
Could you check if the page where you have added the button to open the page consists of the same object that you are trying to pass to the pop up page?
If not, could you please add images in structure mode of both Overview and new edit pages?
Thanks!