Every ARDI server can be accessed via it's web UI.
There is a video overview of the Web UI here
Simply type the name of your ARDI server (usually given to you by a system administrator) into your browsers search bar and you'll be taken straight to ARDI.
Many ARDI servers support more than one site. This allows you to split your ARDI system into manageable pieces, particularly when you have locations that are isolated from one-another.
If your ARDI server contains multiple sites, you'll first need to pick from the list.
If your ARDI server only contains a single site, you'll be automatically signed into that one.
Many ARDI servers run in guest mode, meaning that if you'd like to read information you don't need to log-in.
However some - particularly those exposed to the Internet - require you to login with a username and password.
If prompted, you'll need to sign in with either your standard corporate login, or your ARDI-specific login (which will be given to you by your system administrator).
Once you've picked a site and logged in (which may not be required), you'll now arrive at the full web interface.