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 \

https://steemspeak.com

Oh and i staked you 100 ASS as a bonus for using ASS token