How to login with the private key that I have? (without multiuser)

* ZeroNet version: 0.6.2_____
* Operating system: w10_____
* Web browser: firefox_____
* Tor status: disabled
* Opened port: yes/no
* Special configuration: __/__

the problem:
I had to use the zeronet with multiuser function enabled, and then with one account I got a zeroid.bit id, I don't want to lose that particular id that I made because its my websites name. And also as I see I cannot remove the id and create it again from another login.
I have the users.json and the private keys etc, I can login to this account when the multiuser function enabled but I cannot edit or change anything on my website (This function is disabled on this proxy!).
So how can I login in with the private key that I have?

*the masterkey forwards me to another zeroid, not the one I want