In order to schedule a pickup, you must first create the shipment. For steps on how to do this, please visit: https://support.secureship.ca/hc/en-us/articles/204345598-How-do-I-create-a-shipment
If you have already created the shipment but you do not see it in your Schedule Pickup list, it may be because you have already scheduled a pickup. If you still need to reschedule a pickup, here's how you do it: https://support.secureship.ca/hc/en-us/articles/205043247-How-do-I-reschedule-a-pickup