I tried to subscribe to Dtube for over two weeks until I finally found out how to do it. I typed in my steemit password and it kept saying "wrong password". I wrote an email to steemit and received – busines as usual – no answer. So, now that I know I want to share this information with everybody else who couldn't log into Dtube.
1. First thing you need to do is click on your wallet. You get there by clicking on your profile pic.
2. Now you're in your wallet. Choose PERMISSIONS.
3. There it shows you some different keys. You need the one for POSTING. Click on "show private key". After clicking you can copy the key under POSTING. This is the one you'll need to log into Dtube or the great new platform DSound.