There, you have to chose which district you want to view (i.e. "Lehel"). You will then see PDFs with a streetmap of that district, indicating which system is used in which street.
Unfortunately this infomation is only available in German.

There are 7 different colours and here is a discription of the meaning:
Green areas: "Bewohnerparken" (resident only parking) Parking only with specific permission.
Green/blue dotted areas: until 5 pm parking with ticket (pay and display). From 5 pm on resident only parking
blue areas: parking with ticket (pay and display)
yellow areas: short time parking (maximum 2hrs.). From 6 pm on resident only parking.
blue/brown dotted areas: parking disc parking (maximum 4 hrs.)
red areas : No parking allowed
blue/red dotted areas: from 7 pm on parking allowed (pay and display). Until 7 pm no parking.

Usually you will also find corresponding street signs, so you don't have to run around with a map ;-).
Andy