If you are installing Codacy for the first time, you will be prompted if you wish to have the Control Panel access protected by authentication:
Create user? (y/n)
If you decide to use, you will be prompted for an Username and Password:
Now the access to the Control Panel is protected by username and password.
I forgot my password
If you forgot your password you just need to run the installation script, and a new username/password will be prompted
My current installation doesn't have authentication yet
If your installation doesn't have authentication yet you just need to run the installation script, and a new username/password will be prompted.
Will I lose any data if I install the Control Panel again?
No. No data will be loss if you reinstall the Control Panel, except for the username and password.