To use Dtube you need a Steemit.com account. Then login to Dtube with the Steemit account username,for example "@Lernen" and the "Private Hosting Key".
The "Private Hosting Key" can be found at Steemit.com:
- Click on the user picture
- Click on "Wallet"
- Click on "Permissions"
- Click on "Show Private Key"
- now use the displayed key under "Posting" for Dtube