Every vote is going to be important in this upcoming election. If you happen not to be registered to vote yet, please note: October 4th is the last day you can register to vote in Washington State.
Also, even if you are registered, your voter registration may be marked as Inactive.
The Secretary of Washington State has a website where you can:
Register to vote. You may need to re-register if you've moved or changed your name.
Make sure your voting status is set to Active and change your address online if you are still in the same county.
Otherwise you need to print/submit the paper Change of Address form, available on the page linked to in a variety of languages and formats.
Pass it on! Exercise your rights and fulfill your responsibilities as a citizen. One of the interesting things about being in recovery has been making the acquaintance of people who have been disenfranchised - the right to vote is one of those things you tend to miss when it's gone...