Adobe Premiere Elements

In this session we'll be looking at how to use multiple effects in Premiere Elements. The steps we'll be going through are as follows
1/ Import a video recorded with a 'green screen' as a background
2/ Place this video in the Video 2 section of the timeline
3/ Import the photo of the place you would like yourself to be imposed upon
4/ Place this photo on the Video 1 secion of the timeline
5/ Go to edit, then effects, and search for 'green screen' effect
6/ Drag this effect onto the video
7/ Resize the video so you look in proportion.
Tha't it!

Here is a very easy to follow how-to video on Adobe TV
http://tv.adobe.com/watch/learn-premiere-elements-8/using-multiple-effects/