to rename using your remote control follow below instruction.
go to all app and click file browser.
then local disk
then android
then media
then com.buzz.servcies.pvr (list of recordings will pop up)
now click three bars (hamburger) top left corner located next to home button
then go down to list and highlight the recoding that you want to rename it by clicking ok button and you will see check mark next to it on your right side
then go to top and click third pencil icon next to hamburger and click option of rename (keyboard will popup)
once finish rename just hit back button on remote and click ok and you good to go