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How to reset Heart Rate Zones?

I can't find where to go to adjust my heart rate settings? I've tried on Garmin Connect on the computer and on my phone app, but can't see anywhere for the 'training zones?? I've looked under Settings - User Settings on my iphone and and computer it's not there?!
I have a Garmin 235 and it records my heart rate and shows it on the activity when uploaded.

Help required! Thanks!!