Did you place an Image control on your Designer Screen?
Did you place a Label on your Designer Screen and rename the Label control to lblResult?
It appears you are in serious need of these resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.