Check your browser.  Be sure you are NOT using Internet Explorer.  Internet Explorer is not compatible.

1. Try using Chrome, FireFox, Edge, or Safari.

2. If that doesn’t work, clear the cookies and cache of your browser to ensure you are working with clean data.

3. If that doesn’t work, try a different computer, or a different device (tablet, iPad, smartphone) to ensure that it is not a browser or network settings issue.