How can i put a password on my SQL database?

Hey guyzz! :D I have created my Private Server.. and now i have to put the servers online! But.. i want to spread the Matchserver to my friends!

They need MY GUNZ database to open the matchserver!

Therei s only one problem... my database has no password and username.. instead of that it stands on WINDOWS AUTHENTICATION :(

So my friends need MY PC to make it work! WTF! So here is my question

How can i change the WINDOWS AUTH. Mode to USERNAME AND PASSWORD Mode when i am trying to connect to my SQL database?!

-Demonite-

First of all, when you use the expres edtion your friends[with external pc's] cannot connect normale[only if the use sql injection or something like that]

Second to make an sa account with password you need to install it an choose then use mixed moded loggin, but then also is there win,aut account active.

oh.. so it's impossible to change now? That sucks.. ill find that SQL injector, thanks rotata :)

You can not find an sql injector. That is an type of hacking for databases