Why pgadmin dont enter in admin panel?
According this previous post on Stackoverlfow

Enter your server’s IP address in the “Hostname/ Address” field. Default is localhost.

Specify the “Port” as “5432”.

Enter the name of the database in the “Database Maintenance” field.

Enter your username as postgres and password (use the same password you used when previously configuring the server to accept remote connections) for the database.

Click “Save” to apply the configuration.