How to change Ringtone ID ringtone

New poster and Android user here. I want a unique ringtone for calls coming in that are on my contact list. I found the Ringtone ID function under settings and works just the way I want. What I can't stand is the ringtone being used, it sounds like an icecream truck. How do I change this ringtone for all contacts without doing it one at a time. I tried setting up a group and adding all contacts, and it still uses the same Ringtone ID. Using android 6.0.1 on an LG phone.
Any help would be appreciated.

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