Task: My schedule has changed, thus I need to reschedule the client meeting event for 4 to 5 pm.
Steps:
Swipe down to view the client meeting calendar
Tap on the client meeting option
Tap on the pencil icon
Tap on the time 2:30pm 
Select the hours to four
Select the minutes to 00
Tap on the ok option
Tap on the end time 4:30pm
Select the hours to five
Select the minutes to 00
Tap on the ok option
Tap on the save button at the top right corner of the screen