If you want to vote for the next OSM Foundation board, make sure you are a member before 14th Nov, 2019 00:01 UTC. You can join at https://join.osmfoundation.org
You might want to spread the word to your local community, to ensure as wide and varied representation as possiible.
If you cannot pay the membership fee, you can apply to join the Foundation without paying. Have a look at the post about the Membership Fee Waiver program. Please note that if you apply for a fee waiver now, you will not be eligible to vote at these elections, but you can probably vote at the next ones.