How do i reactivate my Facebook Account?

If you've deactivated your account, you can reactivate it at any time simply by logging in with your login email address and password.

• If you don't remember your password, you can reset it here.
• If you can't remember which email address you use to log in to Facebook, click here.
• If you have other problems logging in to your account, please review the frequently asked questions listed in the Login and Password section of the Help Center.

Tip: If your account has been disabled for security reasons or due to a violation of Facebook’s Statement of Rights and Responsibilities, you may need to contact Facebook to regain access to your account. 

Source: Facebook.com