Hello! It sounds like gatehub.com is a hosted wallet. I often advise users against using online hosted wallet sites like that one. Hosted wallets get hacked all the time. (Mt. Gox all the way to the recent Bitfinex) My advice is to contact the admins of that site to see how they are working to recover its users' funds. I wouldn't waste too much time on it unless it was a significant amount. Good luck!
http://btc2020.com/2015/12/25/bitcoin-101-hosted-wallets/

I actually have a Slack where we are working on a large number of different projects. I am also involved in the www.bitland.world project. Lots of stuff going on. Shoot me an email to know more: brockhager@gmail.com