IPOD Touch

I have recently purchased an Ipod touch for the Logos App.  So far I am really loving it.  I, however, feel very lost in the app.  Right now what I wouild like to do is read a dogmatics book that I have in L4.  When I come across a bible reference I would like to access it and maybe jump to reference in the ESV as my (preferred NIV) is not available.  When I finish with the bible reference....be able to jump back quickly to the dogmatics book.  In a way I would also like to be able to jump to a study bible when I am on either the dogmatics book or the bible to the appropriate spot. 

Basically I want to quickly bounce between these 3 books.  They are all available for the ipod.  I have all 3 ready for offline reading.  How can I go about doing it? 

I think I need some step by step instructions of how to do this.  for ease of explanation just say 3 books and call them book a, b , and c. 

Thanks in advance for the help. 

P.S.    Is there a website that gives instructions in learning how to really use this application?