Here’s the direct link to delete your Facebook account:

Delete Your Facebook Account

https://m.facebook.com/login.php?next=https%3A%2F%2Fm.facebook.com%2Fhelp%2Fdelete_account%3Fwtsid%3Drdr_017jJ4JW3acsd9uxx%26sw_fnr_id%3D732744553%26fnr_t%3D7&refsrc=deprecated&wtsid=rdr_017jJ4JW3acsd9uxx&_rdr=&sw_fnr_id=732744554&fnr_t=7

Make sure you’re logged in to your account before accessing the link.