Miles-and-More: Get 500 miles for free
HRS is a booking portal for hotels, you will get 500 Miles for free if you register with them.
You just need to enter your Miles-and-More number, and you will get 500 miles for free, after registration.
For every future booking made with them, you will receive Miles with the Miles-and-More program.
If you are not planing on booking any rooms with HRS, just register for free and take the 500 Miles ;).