Pick and choose.
The teams have been ordered according to quality. It's not supposed to be perfect as it's only a guide so some teams will have been underrated/overrated.
The poll will stay open for 5 days which should easily be long enough and is public so everyone will know if someone votes for everyone etc.
You may pick multiple clubs to a number within reason.
The 20 teams with the highest votes will take part in the competition. In the event of a tie the board will select the teams that will take part.