Sonim XP3

Bought my 88yr old dad this flip phone.... I need to disable the big yellow button PPT button on the side.... how do I do that?

I have set events in my calendar, and as far as I can figure out, have set to send a reminder/notification two days before and 5 minutes before. I only get a notification tone at the actual time of the event. What am I doing wrong??? There is nothing in the user guide that helps - it pretty much tells me what the calendar does, but not how to actually do it or fix it if it's not working correctly.

Is there a built in navigation app? I've looked for answers online but can't find anything and none of the 4 AT&T stores or 3 Sprint stores carries it.

After I type my search words into sprint google search line, what button or combination of buttons on Sonim xp3 will cause the search to proceed? I sometimes stubble ahead with a combo of center button and then star bottom left and then later not able to use that way at all. If silly question, sorry
Rusty