I have created an account. but I could not logon with my key. I tried using my posting key. not the public hash value for it.

here is one way to login (or "unlock" streemian): http://app-account.streemian.com

the other way to "unlock" is via https://v2.steemconnect.com/authorize/@streemian
which I can see is https at least.... however....

I know I used the right key.

I e-mailed their tech support with no response. Hopefully this is a way to get a solution.