The bypass tube passes behind the exhaust manifold and uses an O-ring which slides over the blistered end of the tube (passenger side). Then i coat both the housing and the end of the tube and O-ring with coolant friendly RTV and you have to push it into the housing. This is easiest when the exhaust manifold is out of the way, or the water pump housing is off (timing belt change), or both. You have to take one or the other off to get at this connection. Lubing up the O-Ring with RTV makes the push-in possible.
Another tip: it is possible to remove the exhaust manifold without draining the coolant. You have to push some plugged hoses onto the turbo coolant lines and when removing the exhaust manifold, you should pry gently on the bypass tube bracket that loops over the last exhaust manifold bolt so that you can gently bend it away enough to pull the manifold yet leave the bypass connected. I've had no coolant leaks this way but I've also RTV'd the heck out of that O-ring oriface, maybe that enables this without creating drips?