How am I supposed to cut or paste codes when I’m trying to design my webpage?

I just tried to design my webpage but I became very confused when I was told to cut the code and paste it to my page. I don’t have any idea about this area. I would really like to have a nice page like everyone else but I’m having a hard time doing so.

CTRL A highlites everything. Or you can do it by clicking before the code, hold down the left button and drag it so the whole code is highlited.
Now hit CTRL C. It copies the code.
Go to where you want to put the code and hit CTRL V. This pastes the code.
Be sure to hold CTRL and press the letter above (A,C, or V) for these to work.
Congrats, you just cut and pasted.