Hi there and welcome
To do this you can download the Kindle reader for your computer via my link below
Click on Download and it will then download to your computer
You can then run it and install it and sign into your account.
If you have forgotten your Amazon password ***** sign into your account, you can reset this here
For your Kindle, if your referring to the screen lock that you have forgotten, depending on which model it is, entering in the code###-##-####or resetmykindle will remove the lock and reset the Kindle.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.