Taking lessons with multiple teachers is perfectly ok! There are a few things you may want to consider before doing so; this article here talks about the upsides and downsides.

To schedule a lesson with a different teacher, on the main schedule page simply click the image of your teacher:

A popup will show, and there you'll be able to select a different teacher.

All of our teachers are excellent; unlike some "tutor listing" companies, we only hire and retain exceptional educators. Our #1 recommendation is to find a teacher whose schedule works well with your schedule. Why? The #1 success factor - by far - that we've seen over many years of teaching is that students who stick to a regular schedule of studying are most successful.