How to select Subtitle Language when watching a movie?

Please note:
• Depending on the Blu-ray Disc / DVD, you may be able to change the desired Subtitle in the Disc Menu. Press the DISC MENU button
• This function depends on what Subtitles are encoded on the disc and may not be available on all Blu-ray Discs/DVDs
• Blu-ray Disc can contain up to 255 Subtitle Languages and a DVD up to 32
• Information about the primary / secondary mode will be also displayed if the Blu-ray Disc has a PIP section
• This function changes both the primary and secondary Subtitles at the same time
• The total number of Subtitles is the sum of the primary and secondary ones