This site is mostly used in spring, when the gondola 'Fiesch-Kühboden' is operating on a very limited schedule due to maintenance.
All pertinent info can be found here:
http://www.paraglidingearth.com/en-html/index.php?site=6604
>>> a most comprehensive 'guide' to flying here: http://flyfiesch.co.nf/ by Rob Smith
Access
cable car 'Mörel - Riederalp', then a few minutes walk to launch
Rules
For detailed info see: >> http://www.paraglidingearth.com/en-html/index.php?site=6604
Airspaces in Switzerland are a tough subject, get all the info you can get before flying: http://www.flyland.ch.
DABS (active danger areas etc): https://www.skybriefing.com/portal/
WEATHER
For detailed info see: >> http://www.paraglidingearth.com/en-html/index.php?site=6604