Park on the right (two cars) at the entrance on the canyon, or a little further on at the chapel.
If approaching from the north - come over the col of Didyma and descend for several kms until a few hundred metres short of the village of Fourni. Turn left and after a couple of hundred metres take the right fork, signposted Katafiki. Follow this dirt road (fairly smooth) for several kms passing a church with lots of outside seating and a board showing the walks and mountain bike routes in the area. There are several concrete sections between the dirt. The road descends and eventually reaches a parking area just short of a crossing of a dried up river bed.
Walk down the gorge in around 10 mins. Very pleasent, the path is marked with red circles. You cross a bridge by a pumping station and arrive at the chapel (GPS: 37.41869N, 23.21487E).
The main red walls are obvious. Keep walking down the track for a few hundred metres to arrive at sector Welcome, where the names are painted clearly at the foot of the routes.