As they progress, they can move to the higher rows. You just imitate to learn the form. This can take awhile, and you will make a lot of mistakes that could be hard to unlearn as you progress. It may be hard to find a park group in Ghana, much less a teacher. I think Tai Chi is a great and rich form of art, and think that it should be taught freely, so I was wondering if there is a way to learn it freely.
Most teachers charge for teaching.
It covers their cost of providing a school. However, some teachers will not charge. Usually, groups who meet in parks allow beginners to study on the back row. As they progress, they can move to the higher rows. You just imitate to learn the form.