my variable product doesn't dropdown but shown in available options

Please help! I bought the Enfold theme just this week and I found out that there are no drop down box to select different product options instead there is a section called “available options” which just lists out all the variable product options, I want to hide the list of variable product options and let my customers choose from a drop down box. Please help!!
This is an example of one of my variable products http://hkstudybuddy.com/index.php/product/tst/