Lay the projector on its side, and slide it open. Underneath the lamp is a socket with two screws. You can unscrew them to remove the lamp and its socket.
The lamp must cool down for at least 15 minutes after use, before moving the projector.
Use a paper towel to hold the new lamp when placing it! Fingerprints will shorten its lifetime.
Thank you for your answer. I unscrew the two screws, but the plastic that keep the lamp is too big so i cannot take it out from it's position, no matter how much i turn it or rotate it :( I am afraid not to brake it. I see the new lamp that doesn't have a fillet, so probably the old lamp it is just pushed in its place, so should i only pull it up strongly?
I can place some photos in 2 days to show in which point of the "problem" i am, maybe you could figure it out from the pictures what i do wrong.
Thank you for the advices about protecting the new lamp, very useful.
I return with photos of me trying to change a silly lamp:)