I just signed up for MailChimp and tried to create my first campaign. I entered the name TEST and said I wanted to create a Regular campaign. MailChimp then asked me to select the recipients and I chose a segment of my mail list that had one email address. At that point, I thought MailChimp was supposed to display a NEXT button for me to click, however, none appeared even though it displayed the segment I created. What am I doing wrong and how can I correct it?