put the tolino back in it's back cover. Mind that the on switch fits well on the switch of the plastic cover (see blue circle on picture)

Flip the on switch once to see if the screen works. Also test the touch and the backlight. If one of them does not work, take the back cover off again and reconnect the cables of the screen.

If everything works screw the screen in place (see red circles)

click the front cover on again and you're done!