How to take off my camera lens?

You can't change lenses on your camera, it's a bridge camera - this means it only has one lens.

Your brother put on a screw on filter to the front, just grab the front of the lens and slowly try to rotate it - if it starts to come loose then continue to rotate it until it comes off. Or you could ask him to take it off for you.

Your camera does not have an interchangeable lens mount system. What your brother placed is a screw-on lens adapter. You can take it off by turning it counter-clockwise. If you are having difficulty taking it off, use a brand new pair of rubber garden or dishwashing gloves.

There should be a button beside the lens. If you push that in, and hold it, you should be able to screw the lens out..