you must use active key , u are logged in with just posting key
you need to just use keychain for desktop
https://chrome.google.com/webstore/detail/steem-keychain/lkcjlnjfpbikmcmbachjpdbijejflpcm?hl=en
or download STEEMWALLEt for mobile then go try again in steem-engine.com
https://play.google.com/store/apps/details?id=app.steemwallet.roelandp
try now
come ask me for help if you need here \
Oh and i staked you 100 ASS as a bonus for using ASS token
Thank you very much for you guide line and bonus.