thank you everyone for your answer and sorry for my late reply!
I don't understand one thing: after i've connected my trezor on my mew's account, my private key are already associated on my trezor's seed or i have first to send my token to my trezor?
You don't need to apologize mate, life always gets in the way

So yeah, trezor holds your private key and generates you addresses based on your seed. You should have now some addresses generated by Trezor where you can send your tokens to. did you managed to find them mate?