Once your stay is approved you'll be able to view profiles of all your potential roommates who are going to your destination on your dates.
You can filter by sex, age, rating, and other personal preferences to find your ideal roommate. Then view their photos, read reviews, and learn about what they’re like. Indicate who you’re comfortable sharing a room with by tagging those profiles. You’ll only match with a roommate if you mutually tag each other.
After you've matched with a roommate you cannot unmatch with them, and you are required to let them stay with you.