Logging in on the web - files.kstnwi.com
In your browser, head over to https://files.kstnwi.com
Enter your email address in the Username or email field, followed by your password in the Password field, and click Log in or hit Enter.
This brings you to your dashboard, which will look something like this:
There are some pre-populated example files, and a Documents folder which is empty.
From here, you will want to interact with the Files tab at the top left to get started
Once you're in the Files section, you can upload files and folders as you like.