SAK 46,
You can log into my easyjet and make the changes, it will then give you a price on how much it costs for the changes you have made. You can then either pay the fees, or just log out without making the change.
With reference to earlier posts about speedy boarding, I have found more often than not, they get to queue first, then on the bus, but as already said, everyone else is then allowed on the bus so you dont gain much at all. I have seen this quite regularly ay Bristol and Glasgow, at Rome Leonardo De Vinci airport (yes I got diverted because of the Ryanair jet issue) they sent a bus ahead with just the speedy boarders on, it was handled very well.
I dont use speedy boarding as we fly as a couple and dont mind not sitting together.