If it's been a while since you tried logging into your website here are the links to get logged in:
In Drupal, you add /user to the end of your domain name. So if your website is https://example.com, then your login URL is https://example.com/user
In Wordpress, you add /wp-admin to the end of your URL. so https://example.com/wp-admin
If you are using Squarespace, you need to go to squarespace.com and click on the "Login" button on the home page.
If you have forgotten your password, all of these options allow you to reset it provided you remember the username or email address you used to set up the account. If not, you can contact us to help you reset it.