What is shapeshifting? Edit
To shapeshift is to change the appearance of your physical body, either partially or completely. It is unknown whether you can only change yourself, or other things as well.
How to shapeshift - incomplete Edit
1. First, you need to fully BELIEVE you can shapeshift. If you have any doubt at all, it won't work. If you know you can, then you can.
2. Visualize as accurately as you can the changes you want to make.
Be careful Edit
Personally, I have some concerns you might want to keep in mind about shapeshifting. First, if you change completely into an animal such as a cougar, the instincts might come with it. Or maybe not, there's no way to know what to expect.
Second, getting back to your normal body could range from easy to difficult.
And finally, you might want to pick a place where you're alone before shapeshifting, so you don't end up scaring people. Even if you tell them what you're about to do, it'll likely come as a big shock to them.
Something to consider Edit
There is very little information anywhere about shapeshifting. Because of this, anything you find is important to understanding what you can do and how to do it. The only way to find out more is to experiment with this ability yourself.
This ability may be hard to believe in, but what if it's real and no one believes in it? A possible reason why there's so little information to be found.