Plugin not works on My listing site This is not convert Price

Hello team,
I have install free version of plugin i want to test is that work
if that works then i will buy premium version to us 5 Currency in site
but this is not work with only 3 currency
site is about listing and price is in custom field
may be that is problem

http://nambizaenterprises.com/modern-inventory/?currency=ZMK

you can see here i have install and use plugin on page
but after selecting currency this is not switch.

Please help me so that it will work and i can buy premium version and use 5 currency over here.