Elgg installation problems


I'm trying to install elgg to my Computer using xampp and ftp.

I downloaded the files and loaded them up to my web server and went to the elgg installation homepage. So far it worked everything just fine.

Then I was supposed to change the engine/settings.example.php to engine/settings.php which I did and the I cliced refresh.

Now, all I get is:

Welcome to Elgg. Elgg couldn't connect to the database using the given credentials.


What do I do now? The thing is, I am a non IT person, this whole thing is for a college project.
I know there is a solution in the guideline that I should enter my database infos in the php file, but I don't now how and which Infos...


Please, can somebody help me? I really need Elgg asap.

Thanks a lot!