Holding down the bottom right button and then holding the Power button per instructions. After a bit the screen shows the Yes/No fields with NO highlighted. Problem is the up/down buttons on the left do not seem to do anything so I cannot select YES.
BTW, am attempting to solve an issue with a very slow response to pushing the Activity button, sometimes it takes 5 seconds or more for the screen to change over. Talked to Garmin CS about this and they suggested the Memory may be too full and a Hard Reset would clear the memory and should restore the responsiveness of the 235 when it was new.