How do I save voicenote as ringtone? iphone 5

Question

I'm new to the IPhone.  I just bought the Iphone5.  Recorded a voicenote and would like to use it as a ringtone.  E-mailed the file to my WINDOWs-PC, renamed it to Ringtest.m4r, then E-mailed it back to my IPhone. There's no option to save it to Ringers, or Custom Ringers.
Any ideas would be appreciated.  Is there an APP that will let me manage files on and from my IPhone?

Answer 1

Maximize iPhone Battery (iOS7):
1) Turn off Airdrop: Control Center >AirDrop > Off
2) Limit background app refresh. Turn it off for applications such as Google/Facebook. Settings > General > Background App Refresh
3) Turn off automatic updates: Settings > iTunes & App Store >  Updates and Apps (off)
4) Unneccessary Location Services: Settings > Privacy > Location Services > System Services > Off (uncheck as needed)
5) Turn off Paralax: Settings > General > Accessibility > Reduce Motion
6) Siri, and her 'raise to speak.' Turn it off: Settings > General > Siri > Raise to Speak
7) Exclude items from Spotlight search as needed: Settings > General > Spotlight Search
8) Remove unneccessary notifications: Settings > Notification Center > None (per app basis)
9) Make sure auto-brightness is on, or reduce the brightness to 25% or less if desired. Settings > Wallpapers & Brightness
10) Use Still backgrounds only: Settings > Wallpapers & Brightness> Choose Wallpaper
11) Fetch email instead of "Push":  Settings > Mail, Contacts, Calendar > Fetch New Data > Push(off) & Fetch every 15 minutes
12) Disable LTE if needed: Settings > Cellular > Enable 4G/LTE (OFF)
13) Reduce Autolock: Settings > General > Auto-Lock > 1 Minute
14) Disable Vibrations with Ring: Settings > Sounds > Vibrate on Ring (off)
15) Close Applications regularly: Double Tap Home Button > Swipe up on App to close