for removing the VAT text in a template you must delete this line of text:

So copy the systemtemplate you want to use and change the line I marked green in the previous mail:

 <span class="atkp-priceinfo">{{$formatter->get_priceinfotext($product)}}</span>

You can delete it or you can also change it to:

 <span class="atkp-priceinfo">This link is an affiliate link </span>

For changing the currency symbol in dollar you need to change this in your amazon shop (wp backend):

and you can also change it to custom symbol. Set prefix and suffix: