How do you record a video with a built in webcam?

Hi i want to get a youtube account but my mom said not until i get a camera. then my dad gave me this computer for my birthday and it has a webcam built into it.it's like his only smaller. (it's the newer model) it says SD.MS/Pro.MMC.XD and HP Pavilion dv2415nr Entertainment Notebook PC and ALTEC LANSING.the webcam says web cam 13mp. Plz keep it simple and if you do i'll mention you on youtube! THX!!!