The construction um...zu is used to express a goal (in
order to). Example sentences:
Bettina arbeitet, um Geld zu verdienen, aber auch, um
Kontakt zu anderen Menschen zu haben.(Bettina works to earn
money, but also to have contact with other people.)
Du solltest zum Arzt gehen, um dich untersuchen zu
lassen.(You should go to a doctor to have yourself
checked.)
Ich bin hier, um mich für den Kurs anzumelden.(I am here to sign up for the class.).
Markus treibt Sport, um fit zu bleiben.(Markus plays
sports to remain fit.)