The first step is to determine if the website you want to edit is a Sitefarm Website. Scroll to the bottom of any page and look for: "This site is officially grown in SiteFarm." If you see this, the website is a Sitefarm website.
On the Sitefarm website you would like to log into, scroll to the bottom of the page. Under the "Admin Links" section, click the "Login" button to reach the login page.