Once you've found an event you like, click 'Join event' and you'll be good to go in just a few moments. Input your shipping address and choose your distance category before confirming your entry into the event. You can save your delivery address on your profile to make it quicker for you next time you join an event.
If you have entered a 'Solo' or 'Challenge' event, check the event dates for when you will need to complete your activities. If you haven't linked a Strava account, you can manually upload your activities by clicking 'Add Run' and inputting the distance/time and image. Whether you sync through Strava or 'Add Run' manually, you will see the distance added to your event within 24 hours. You can view all of your events on the 'My Events' page.