Once your account information is entered and you've configured at least one incoming phone number, click on the Check settings and account status hyperlink. VSys will connect to Twilio, validate your login information, and check the correctness of each incoming phone number. If all is well, your account status, in the upper-right corner, will show as "Active/verified". If not, check that your login information is correct and that your phone numbers are valid and configured as described in the Twilio Account Setup screen.
Click Save to save these settings and you're on your way to sending and receiving text messages.