Click to unlock. Once your on start screen, click an icon to open it. To put it to the toolbar on the bottom of the screen, click and drag it to the bottom. To remove the last icon from the toolbar, click and drag the icon you want to get rid of back down to it.
I am making a Windows simulator :D So far it only has a quick calculator and the internet. I will add more stuff from time to time. Note: You can only have three icons on the toolbar at a time.