Put T-hose back on the turbo as circled in RED.
Next step is to Prime the turbo. What I have done is to pull the ignition fuse (#11) from the fuse box under the steering wheel column. Crank the engine for a few times or so to make sure oil has reached the turbo.
As a final step, it's up to you on how to reflash the ECU using your own EM. Also, make sure to check for any leak around downpipe and turbo areas. It's good to check after a day of install to see if there are any oil leaks in the turbo areas as you don't want to have oil starvation problem. Check engine oil level daily for a few days while car is not running on a flat surface.
Most important step is to refill lost coolant. Easiest method is to turn on the engine after you are done priming the turbo and adding coolant through a tiny coolant reservoir (reservior with 'blitz' written on the cap). You can see bubbles coming out as you add coolant and coolant level dropping. Keep adding coolant until level doesn't drop anymore.