Welcome to the forum!
The easiest way I know how to do this is to make a backward loop around your thumb and slip the loop onto the needle. Here's a demo:[FONT=Arial][SIZE=3]http://www.knittinghelp.com/knitting/basic_techniques/[/SIZE][/FONT]
[FONT=Arial]Scroll down to Backward Loop Cast On.[/FONT]
[FONT=Arial]There are other ways, but as a new knitter, this is the easiest. Be sure you CO loosely, so you can knit it easily. You will just knit those stitches as you did the rest![/FONT]
[FONT=Arial]Good luck and have fun!:woot:[/FONT]