You need to place a breakpoint here (see image) It should trigger when you click “play” on the player and you are in the “debugger” perspective.
Then, using console perspective (or submenu within the debug perspective) write: t.videoDetail.videoIsPay = 1
Console should write “1” in the new line as the response to your input.
Afraid that’s a max I could help without getting into basics of javascript =)