Changing data fields on watchface

Just got my Venu X1 and liking if so far. But cannot for the life of me figure out how to change data fields on the watch faces. I get to where the data field turns green with little up and down arrows and it says what the current setting is at the bottom of the screen but can’t get it to change. The manual was no help so I’m hoping someone on here can lend me a hand.