I've been told there's another Green Gym in Formby, this is sited in the recreational space at Deansgate Lane.

Following some research I came across this demonstration video explaining how to use this item. I hope it helps. I'm was going to publish a series of these but if you play the first episode you're offered some more short demonstrations. They're well worth viewing.

(Source: http://fresh-airfitness.co.uk/)

If you see anymore Green Gym installations please let me know. So far I'm aware of three others in Duke Street Park, Lifeboat Road parking area and at the Swimming Pool.