Ensure you have configured NGINX and SSL correctly.
Grafana runs behind NGINX proxy, which takes care of ssl and serves Grafana on https://dashboard.zibawa.com instead of port 3000.
A sample grafana.ini file is included in the distribution. The file includes comments of how to configure Grafana specifically for Zibawa.
Login to grafana on https://dashboard.hostname.com
Login to the default acccount (this account is created by Grafana the first time you start and is NOT a Zibawa or LDAP account).
You can now change the password.
Note that although Grafana is designed to work with LDAP, Zibawa uses the Grafana api directly to sync passwords for users.