If you want to just draw or write a story, they have directions for finding someone to pair with:
If you have a story to tell but aren’t an artist, or if you’re an artist who wants to contribute but doesn’t know what to draw, we want you to team up! Use the hashtag #ComicsForChoice on Twitter to find each other, or if you’d prefer to remain anonymous, email us at email@example.com before December 23rd, and we will do our best to pair you with someone. All genders are welcome!
Can’t wait to see this come together; there are important stories to share, and everything will help moving forward.