How do I fix the cover over the right ear?

How do I fix the cover over the right ear?

The white cover over the right side of the head phone has started to come off and I want to know how to reattach it.

ANSWERS:

"Here’s how to do it:

https://www.youtube.com/watch?v=CCzrrgwF...

Here’s where to get a replacement:

https://www.amazon.com/Replacement-Earpa..."