In Classify There are two places where we shown currency tag (Symbol).

1- Pricing Plan: If you will go to

WordPress Dashboard --> Classify Options --> PayPal --> Here you will see 
option to select Currency

If You can't find your currency then please visit this link and make sure your currency is listed here or not.

https://developer.paypal.com/docs/classic/mass-pay/integration-guide/currency_codes/

If Your currency is listed then then sure submit ticket and we will add that, Otherwise its mean PayPal don't allow us.

2- Price Tag (Symbol) with Ads:

We have leave this option on user end, User Can Put Ads Price like this.

Free
Negotiable 
$1500 Per Month
$50 Per Hours
$5000
Etc, So User can put what he want we have not fixed any currency tag here, Hope this will help you.

Thanks for your time.