Please Help! Sending book to Kindle app via calibre

:help:I have looked everywhere I can find, but am not very computer savy. I am using Calibre 4.10 ( I think) and I want to use the MOBI format and send books to a Kindle App on my Samsung galaxy TabA. The program does not let me specify where the book will go. It just allows me to send to the Main storage.I used to be able to send it and I could then see it in Kindle app. Now I can only find it it The cc folder, When I open the internal storage. I can then copy and paste it to the Kindle Folder. What can I do to have it go directly where I want it to go. I have a Nook app, and that doesn't work either.