is it a galaxy samsung tablet ?
in apps find an app labelled as my files with a folder icon above it
under root/sdcard/music
find music file click on the little box left of the file you wish to delete
a green tick will show in the box
once you do that you will notice at the top of the screen a dustbin icon has appeared in the right top side. press this icon to delete the file. then click on yes when it asks if you want this item deleted.
Then double click back icon to get out of my files
back icon is bottom left corner on black part of screen.
Are you close enough to the printer? Bluetooth range is only about 6 feet max. is the printer wi/fi capable? Print to google cloud print and associate it with your printer.
Have you allowed it through your settings? This could possibly be why. The link I am providing below is has a lot of questions and answers that may or may not help
https://www.ifixit.com/Answers/Device/Samsung%20Galaxy%20Tab
This one may also help, there is two options you can go with
1) Help and trouble shooting, once you click on it, it will ask you what product and take you to a place where the most common stuff is
2) or you can contact live support which would probably be the fastest
Hope this helped a bit
on a tablet all your down loads are in the " my files " which must be accessed in the pull down menu , if you opened it in a browser.
However movietube is in the play store as an app . if you got it from the app store . and it installed but is not showing then you have a full screen an need to tap the all apps icon lower right corner . it is the square with rows of dots. then search till you find it. if not then get it from the app store / play store i checked and it is there.