How do I call a shell script that requires say 3 parameters $1, $2, $3?

Basically, I have a shell script that I want certain users with valid password to use it. As the username and valid password will be the 3 parameters the script requires.
Eg: I want to run the script (say test.sh) and pass the username and password (Scott/tiger@db) as a parameter.

Can someone help please?

Thanks..