So sorry to hear this is happening! How are you adding your contacts (one at a time, copying and pasting multiple at once)? Are you seeing any error messages or is the Save button unresponsive? What browser are you working in? If you have not yet trying in a different browser or a private/incognito window I would suggest this! After testing in the Contacts page of your account I was unable to replicate this same experience. I was able to successfully add a test email address to your account.
Our "Email Marketing Mastery Series" webinar this week is covering Email Automation!
I think you will find this webinar, along with the other free weekly webinars we offer helpful in learning about Constant Contact and what it can offer you, and your clients so you can get the most out of your free trial!
Here's the link to register for free!
If your unable to make the webinar, you can email me at firstname.lastname@example.org for additional guidance and tips!