I'm trying to purchase my membership, but I'm getting a 404 error upon checkout.

Our membership purchase flow is built on Shopify which requires an email address to checkout. If you're receiving an 404 error upon checking out, go back to your account, the email address field is probably empty. Use the pencil icon to edit your profile information, enter your email address under the profile page in your account, then proceed to purchase your membership and you should be able to complete your purchase.