Where the subtitle button lives
Start any video in the Cinemana app and tap the screen once to bring up the player controls. Look for the speech-bubble or CC icon, usually near the settings gear. Tapping it opens the subtitle track list for that title. If you installed from the Cinemana APK home page, the player is the stock one and the button is in the same place on every title. This works the same in every recent release.
Picking the Arabic track
The track list shows each available language. Select Arabic and the subs appear within a second or two. Some titles list several Arabic options (for example, different encodings): if one shows garbled characters, try the next. Your choice sticks for the rest of the video.
When subtitles will not show
First, confirm the title actually has a subtitle track: an empty track list means there is nothing to turn on. Second, check whether the difference between dubbed and subtitled versions matters for that title. Third, restart the video after changing tracks; a few titles only apply the new track on a fresh play. If the whole player looks broken, the not-working fixes reset things in order.

