Correct minor issues (no more than 1 hour) for OpenCart

I need an expert to correct one mistake in chekout process of opencart, our last programmer said it was very easy to fix, just edit and change code to utf-8 or something like that, but he is unavailable and we dont know how to do it. Sin ce this would only be a 10 usd project and the minimum is 30. You can make other minor changes in the opencart template. If this only takes you less than an hour you can compensate making a banner or something else we might think of. This project is urgent because we are losing sales due to chekout error in page.