I am sure there is someone on here that could answer that question but I would steer you towards an online Toyota forum. There are several of these out there with Toyota specific enthusiasts that can help you through your entire project.
Typically, transmission fluid is added in a port on the transmission housing, not the engine. A service manual would have the specific instructions for your make/model/year. For a manual, check on the manufacturer's website and/or do a Google Search using the make, model, year and "PDF" in the keywords box.
