[Riser]

Can't find the option to allow changing votes.

Under poll options you'll find the option that says "allow users to change votes" with a check box to check.

Poll Options:
Result visibility:
Show the poll's results to anyone.
Only show the results after someone has voted.
Only show the results after the poll has expired. Reset Vote Count
Check this if you want to reset all vote counts to 0.

is all i see