How to secure your Facebook Account - Change your FB password

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Your account should represent you, and you should be the only person who has access to it. If someone gains access to your account, or creates an account to pretend to be you or someone else, Facebook's team could help but you need to help yourself first.

If you think your account has been hacked or taken over, you should visit this link https://web.facebook.com/hacked to secure your account. From there, you'll be asked you to change your password and review recent login activity.

Your account may have been hacked if you notice:

• Your email or password have changed
• Your name or birthday have changed
• Friend requests have been sent to people you don't know
• Messages have been sent that you didn't write
• Posts have been made that you didn't create

So, here's how to secure your Facebook Account by changing your password

On Your Application

1. Login to your Facebook account.
2. Select the Menu ☰ button located at the upper-right corner.
3. Scroll down and select “Account settings“.
4. Choose "Security and Login".
5. Scroll down and select "Change Password".
6. Fill in the "Current password", "New password" and "Re-type New password" fields.
7. Select the “Save changes” button when you’re done.

On Your Browser

1. Log in your Facebook account details
2. Click in the top right corner of any Facebook page 
3. On the drop down menu, select "Settings"
4. Click on "Security and Login" on the left hand side of the pop up page.
5. Under "Login" click on "Edit" at the right-hand of "Change password"
6. Fill in the "Current", "New" and "Retype New" fields. Current is your current password, New is the new password you want to change your current to and Retype New means you should retype that your new password.
7. Click on "Save Changes".

• Source: Facebook Account Guide.