No special access issues
No special rules, just be respectfull of the environment.
From Funchal, take the VR1 to Ribeira Brava, then go north to Serra d'Água and up Encumeada, you will find a viewpoint with plenty of space to park.
From there, you need to pass the fence trow some wood stairs and go down by the trail until you find the first sector, for the second sector, just go a bit further down.