Your happyville.org account is one of Google account, you need to use one of happyville.org accounts to access member.happyville.org site.
When you try to access member.happyville.org site, you may see this "not found" message; which meens you have logged in to one of Google service, such as Gmail, using some other Google account.
You need to switch active Google account to your happyville.org account. Please continue below.
Go to "myaccount.google.com" page to click your current account icon at the right-top corner. In the left example case, click (K) icone.
The drop down dialog opens. You want to click "Sign out". Then you will start the easy case below.
Instead of "Sign out", if you click "Add another account", you need to select the happyville.org account before accessing to member.happyville.org site.
When you accessed to member.happyville.org site, you would see this [Sign in] dialog; which is fine.
Just sign in with your happyville.org account and password. You have entered the village.