You have to pick it up by yourself. Do you have a postbox somewhere? In this is the case, you had to receive a notification. If you don't have a postbox you go to the main post office in Down town and take your track number and passport with you. In your presence they open the box to see what is inside and maybe you have to pay some taxes, but this depends on the weight and the content of the package.
Maybe you have to pay a "fee" for keeping your package in storage, if you don't pick it up after a certain of time, they do.
A tip: if you don't have a postbox and you want in the future receiver more packages, let they (the people who want to send something to you) write your number on the package so they can call you when its arrived.