Basically, you have to have the HUB ID of the person you're giving the shift to, then you just fill in the appropriate details like the location hours of work and submit it. It goes into the system and within a day or two you'll see if it's approved or denied. The most common reason shifts get denied is that the person taking the shift will be getting overtime or double back so it's best to make sure that is not the case beforehand. I've also been part of instances where managers will make the change at the work location if both cast members are present and bypass the HUB altogether, same for shift exhanges. Hope this helps!