T-bana #13 (RED LINE) to Ropsten, be at the ass-end of the train and go out through the tunnel against Hjorthagen. Then follow half-arrows to ON-OUT(doors)... It´s a 16 min walk according to Google, so be on time.
U can also use Bus #6, 55 or 75 towards Ropsten and exit at the stop "Gasverket". Google says 5 min...
If U drive your Metalbox on 4 wheels, you can park it on Norra Fiskartorpsvägen close to ON-OUT(doors) or in Norra Djurgårdsstaden.
Bikers, runners & walkers look for known faces somewhere on the green fields on side of Norra Fiskartorpsvägen, or use your satnav.