If you are registering for the first time and cannot see the buttons that are needed to click on to continue through the steps, the problem may be that the web browser you are using is out of date. There are two ways to resolve this:
1) Check to see if you're browser needs updating. Once new updates are installed, try registering in Tango again.
2) Open a different web browser (Firefox, Internet Explorer, Google Chrome, etc) and start the registration process.