Hvert år bliver Adobe export pdf fornyet automatisk, men jeg er ikke rigtig klar over hvad jeg kan bruger det til. Kan i give en forklaring inden jeg annulerer det?

The subscription auto-renews as you are paying for the service of being able to export your pdf's into another application and edit then accordingly. There are also many other things you can do with the subscription, so have a look here and then you can make a decision:

Using Adobe Export PDF

Good luck with making your decision!