First place your rintones file to a designated area (e.g. desktop)
Second, import your ringtones file into your LIBRARY, NOT directly into your iphone.
Third, "TONES" or "RINGTONES" icon will appear on the left hand column under LIBRARY. (You should see Ringtones there. If not..... Click Edit --> Preferences --> General Icon Ensure that Ringtones is checked. If not, check it then click OK…)
Fourth, drag your ringtones file from your LIBRARY into your iphone.
Fifth, "TONES" or "RINGTONES" icon will appear in your iphone under devices (the tab where Summary, Info, Apps, etc are located)
Sixth, click Under "TONES" or "RINGTONES" (as mentioned in Fifth) and tick SYNC tones.
Seven, look inside your iphone... and there it is