How do i open theese headphones?

What make and model headphones?

How old are the headphones? Any warranty left?

If there is warranty left then return the headphones for a refund or replacement.

If no warranty left, opening the headphones is unlikely to lead to a fix. Reason being that the USB port has likely broken loose inside and would need to be re-soldered or otherwise require some level of skilled repair.

However, if you have nothing to lose then taking the headphones apart is worth a try.

Most likely you will need to peel off any padding or labels that hide screws.

Or possibly use a small screw driver to pop apart any seams.

Note: Link did not directly lead to video (.mov) so I could not view the video.