you can take East Rail line from Kowloon Tong to Hung Hom and change West Rail line from Hung Hom to Tuen Mun and change MTR buses No.506 or light rail route No.507 to Tuen Mun Ferry Pier
Fee:$15/$8(for Octopus)
$20/$10.5(for single ride tickets)
Times:46 mins(not included the waiting times and walking times)
Hope above information can help you!