Problems with checkout page

I am having some problems with checkout page. i am using the brazilian market plugin which requires CPF to be entered but I am trying to get custumers to check out in their own currencies and i am trying to get the CPF and legal person thing to only appear if the person is buying in Brazil but currently its not working as it should.and i was having some problems where the BRL currency was showing side by side other currencies but i think i have fixed that, so now i just need help with the brazilian market CPF thing. Please help