from köln hbf
After leaving the rails, walk towards the main entrance. Don't go outside the station though. At the left hand besides the main entrance, there is a pedestrian underpass leading to the subway, headed by a blue "U" sign. Go down there.
Now take the next underpass at the right hand, going downstairs to the subway rails, as to be seen on this picture:
Now you can take any subway train (except the no.5). Get out on the next but one stop, named Neumarkt. After getting out, take the stairs up at your right hand. Take the next stairs up as shown on the following picture:
Now go to overground tram rail no.3 and take the tramline no.7 (direction: Zündorf) or tramline no.8 (direction: Porz-Markt).
At the fifth station, after riding for about 10 minutes, you should get out at the stop named Poller Kirchweg. From there, follow the Evoke signs.
The tickets for this trip are called "Preisstufe 1b". They cost 2 Euro, you should have coins handy.