Oh and you have to go into your STEEMIT BLOG, this is where your "wallet" is. Here is some replies I got when I had the same problem:
cpt.laserbeam (35)in steemit • 3 months ago
RE: Please help: I cannot log into DTube with my Steemit Account... whats wrong?
To fix it, toggle the PRIVATE posting key
$0.00
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heimindanger (66)in dtube • 3 months ago
RE: D.Tube 0.5: Big Optimizations
you need to use the private posting key for logging on dtube (a different one with lower authorizations). Please read…