You can just grab the link for your youtube videos from the watch page by clicking the share button below each video. You can also copy the share URL from the video manager by going to info & settings for each video, there will be a link there.

I'm having trouble with uploading videos on DTube a lot lately myself. The days I can't get it to work I may just stick with making blog posts on steemit and embedding the video fro youtube as well.