How can i change db setup without log in?

i made stupid mistake – input wrong user and password for database setting. sambapos kick me out then, cant get in. i got this error.

how can i change database info within get into the system?

Just modify it from that screen then click ok. Or go to c:\programdata\sambapos\sambapos5 and delete sambasettings.txt then restart sambaPOS. That directory is hidden so you should enable the option to see hidden files and directories.