The filter buttons are located under the Search bar. You can use the filter to choose:
Category: Choose the category of content. Choose from Animation, Comedy, Interview, Movie, Song, or News.
Series: Choose a series of content.
Accent: Choose the accent of the content. Choose from US, UK, or AU.
Difficulty: Choose the difficulty of the content. Choose from the level of 1 ~ 3 stars.
Progress: Choose your progress of the content you are searching for. Choose from Not Studied, In Progress or Completed.
Length of content: Choose the length of the content. Choose from Short, Medium, or Long.
You can reset the filter by touching the white 'X' button in the red filter box under the touch screen, or touch each of the filters and touch the red reset button in the selection screen.