NEED HELP ASAP THANKS

Hi,

I have attached 2 screens shots, the first one is : I was able to find where pictures are located but I couldn't find where I can change youtube videos, Please, if possible to provide help as soon as possible while my client is after.

The second picture, it's about music download and play... After changing mp3 file in the folder, this message appeared "Your browser does not support the audio element", So please can I have help or support to sort out in this matter.

Thank you

You need to provide .ogg and .mp3 files both like it was in hot start because some browsers support mp3 others ogg