How to change window size

Well, i have been searching for quite a while, and i couldnt find an answer to my question, "how do i change the window size?"

because the video in the start has it on the propieties column, but i dont, i guess they are different versions.

Here, a screenshot to show i havent it;

<img src="http://img46.imageshack.us/img46/7774/error1s.png" border="0" />

I checked some tutorials too, but they use a tiled background, so the window size doesnt matter so much, while im using a sprite, as im trying to do a simple platformer.

By the way, sorry, i just got the program today and im a newbie at this xD

What you display is the layout properties.

What you are looking for is in the project properties, when you click the project bar.

Oooh, alright, i found it, thank you!

i checked that before, but i couldnt find it, also, sorry again, as i said, im a newbie xD