I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.
I'll provide a link to register, please come back to your post so we can further assist you . Thank you
The default player" is the player that runs when you launch a video or an audio file by tapping that file. If that's what's happening, go to Settings > Applications, find that file, scroll down to Defaults, and Clear Defaults.