Places to advertise freelance English lessons.

There are so many online schools to compete. Many schools teach English as a second language.
There is A Gazeta online newspaper in various cities.
Good luck.

I wasn't going to charge as much, I was thinking $6/hr, which is cheap for one on one.  I mainly want to try it before I know if it is something I could do or not.

I also don't want to go to Brazil and get an English teaching job and find out I don't want to do it.  I thought this would be a good way to find out.

Oh, and hopefully improve my Portuguese a little, I haven't spoken it for years.

Great rate for sure, Worry about payment but you probably have it figures out,

Yeah, it sounds like most freelance teachers use paypal.  I'm not even sure how that would work in Brazil, is there paypal?  From what I read most freelance teachers have students in rich Asian countries where paypal isn't a problem.  I know there are a few countries where either paypal doesn't exist or money can't be sent from their country to the US.

Yeah, I can't find any information on teaching online to Brazilians specifically.  Like I said, most online students are from Asia.

There is paypal in some areas, but many cannot afford. Sending and receiving money from BR the cost and regulations is limited and costs would be more than the lesson. $5/hr is +-$20 reals. Teachers here only make $500 to $900 reals/month. Larger Universities maybe more..
I believe you would need to have a  credit card to sign up, but still have the FT fees that te students need to deal with.
Not sure as BR internet regulations. Some sites I try are block n Brazil.