Change an Existing Meeting to a newly created template

Hi,
I have updated a template and would like to use for an upcoming meeting. I cant seem to find the button to change the meeting to my template. I have been searching for an hour now. Do I have to redo the template in the already created meeting or is there a way to delete the meeting and then recreate it with the template? I'm a new president and this is really tripping me up. Any help is appreciated.
Thanks

Once a dated agenda is created template changes have no affect.
Print the existing dated agenda
Delete the existed dated agenda
create a new dated agenda with the same date
update all the roles with the same people, and save.