On the Iphone app, there is no back button. So for example, if you go into the search bar to look for a specific card you have to completely close the app, there is no way to go back "home" after the search.
Instead of a back button, the iOS app has X's in the search fields that should clear out a recent search. It depends on which Search field you're in, but generally clicking the X within that search field should get you back to where you were before.
If you're searching for a Card within a Board, clicking the X will show the full board again. From there, clicking the X in the top-left will take you back to a list of boards in your account.
If you're not seeing where to click, could you upload a screenshot of the page where you're feeling stuck and we can take a closer look?
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