Facebook stores all user information and data on its own Web servers rather than on the individual user's computer. This means that you can access your Facebook account from any computer or mobile device with a Web browser and an Internet connection. To sign in to your Facebook account from another computer, you will need your usual Facebook login details.
Open the computer's Web browser.
Enter facebook.com into the Web browser's address bar, and then press return on the computer keyboard. Find the login section at the top of the Facebook home page.
Type your usual Facebook login email address or username into the "Email" field, and type your password into the "Password" field.
Click the "Log In" button. This opens your Facebook account.
Most users log in to Facebook with an email address. However, you can also log in with your username if you have previously set up a username for your Facebook account. If you've registered a cell phone to work with Facebook, you can also use the cell phone number as your username.
In Step 3, always click the “Keep Me Logged In” check-box to untick and deselect this option if you’re using someone else’s computer, or a computer in a public place. This prevents another user from accessing your Facebook account from the same computer.