You can book your Rider Express bus ticket from any possible city to Edmonton by 4 options;

Online - Visit https://riderexpress.ticpoi.com/sales/trip-search-results?from=edmonton to purchase your ticket online from your computer, tablet or smartphone
By Phone - Call 1-833-583-3636 to book your bus travel on the phone
In Person - Visit one of Rider Express offices to reserve your bus seat
On Bus - You can go directly to the Rider Express Edmonton bus station and pay the driver (subject to availability).