Cant get the shortcode to work

Hi.. well i would like to give my customers a opportunity to cancel there own appointments..

I am all new to this, and a have added the following shortcode:

[app_my_appointments allow_cancel="1"]

but there is no possibility to cancel an appointment.. can anybody please push me in the right direction??

One more thing..

When the hit the "submit" button to place an appointment, the page do not refresh.. the funny little "wheel" is just turning and turning.. when I manually refresh the page, the appointment is placed...?..

//Daniel