Need help determining how duties/taxes etc. are collected

I’m in the U.S.
I want to buy an Exquis.
But it says I am responsible for duties/taxes/etc.
What exactly is it that I have to do? Who do I pay? How do I pay?
How much can I expect to pay (ball park)?

For the US, the price of the Exquis is too low so you won’t need to pay duties when the parcel enters the country

Thank you for your reply. I appreciate it.