Your WordPress site has three different addresses (replace acmeblog with your WordPress site name)
acmeblog.onpressidium.com Production URL
acmeblog.dev.onpressidium.com Staging URL
sftp.acmeblog.onpressidium.com SFTP address
If you don't remember the name of your WordPress site, do the following:
Login to the Pressidium Dashboard.
Select the Websites menu option from the Dashboard sidebar.
You will be presented with a list of your currently hosted WordPress sites. Click on a site's name to go to the website overview.
You can also quickly navigate to / search for a website by pressing the S key to display the Website quick search dialog and typing the website name.