Hello there,
Go to the Groundspeak web site's main page a.i. www.geocaching.com. On the righthand site and second from the top you find a link called 'Geocaching Applications'. Just click on the link and on the next page select 'Android' that is located in the center of the page. Now just follow the instructions to download the app on you Android phone or tablet.
When using this app you do not need to enter coordinates because you can use the option 'navigate to cache' from within the app.
Good luck an happy caching,
Roma51
Ron
Belgium