@dtube can help better than I.
My understanding is that you use your posting key, from inside of ypur wallet, the permission section, the posting key, the hidden posting key which you reveal, copy that and use your steam name and that (hidden posting key from the permission section of the wallet tab) to log into dtube.
Have patience., it takes time to upload.
Good luck .
Thankyou, for your response. Good luck to you as well Merry Christmas