Android Question Navigation of project

I may not be doing this properly, but I created multiple modules and was trying to figure out how to navigate between them. I know in VB it is Show and Hide but I must be using the terminology all wrong because I cant find an answer in the documentation or online board. Also how to do make a page/module the first one to open up when the project is run?

Thanks in advance.
I would like to thank David Erez for all of his help. Yes he showed me how to connect to the different modules. Crazy question though is there a way to exit a program other than clicking the back or home keys on the device?

Thanks everyone for all of your help.
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Thank you very much. Now I see what you are talking about with the code help. I had been typing so fast that I either did not see it or it did not have a chance to pop up.
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