Hi,
I don't know if the following two videos will be of any help, hopefully they will be.
This one shows how to open a Toshiba P55W laptop, but not how to remove the keyboard.
https://www.youtube.com/watch?v=XdzsayVULfU
This one shows a ''fix'' for a keyboard problem in a Toshiba P55W laptop. It may not be your problem as you do not say what the problem is.
https://www.youtube.com/watch?v=eaBUdWEMaP0
If you still need to replace your keyboard, after watching these videos, you may to able to work out what else you have to remove to gain access to the keyboard.