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

1- Pricing Plan: If you will go to

WordPress Dashboard --> Classiera 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:

You can set your own currency tag from Theme Options

Just need to go WordPress Dashboard --> Classiera Options --> Post Ads --> Scroll down and at the last you will see option for "Currency Tag", Just Place tag there.

or you can leave this option for user and user can put value 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.