you can take MTR Tsuen wan line from Lai Chi Kok Station to Prince Edward Station and change Kwun Tong line from Price Edward Station to Tiu Keng Leng Station and change Tseung Kwan O line to Po Lam Station
Fee:$8/$3.6(for Octopus)
$8.5/$4(for single ride tickets)
Times:40 mis(not including the waiting times)
But if you want more convinence,you can take KMB Bus No.98C at below stop
Get on point:荔枝角鐵路站,長沙灣光昌街,長沙灣興華街 or 元州
Get off point:寶林消防局,英明苑,欣景路 or 景林
Fee:$9.2
Times:60 mins(not including the waiting times)
KMB Bus No.98C details:
http://www.kmb.hk/chinese.php?page=search&prog=route_no.php&route_no=98c
Hope above information can help you!