You can take West Rail line from Tin Shui Wai Station to Tuen Mun Station and go exit at F.Here is the public transport interchange and you should walk over the foot bridge and you can see a park.仁愛堂 is in the Yan Oi Town Plaza.
Her is Tuen Mun Station map:
http://www.mtr.com.hk/jplanner/images/maps/tum.pdf
Fee:$4.2/$2.1(for Octopus)
$5/$2.5(for single ride tickets)
times:9 mins(not including the waiting times)
Hope above information can help you!