Hi @HeatherClowdus ...
The FFT (Free For Teacher) version of Canvas does not have an "admin" area, so there are some things that are more limited in what you can and cannot do compared to a standard paid Canvas environment (which does have an "admin" area). You can compare the differences between the two at:
Canvas Free-for-Teacher FAQ
On this page, you'll also find a linked PDF which contains a comparison table.
As far as H5P is concerned... I'm not sure that integrating at the course level inside of a FFT course is possible. At the College where I work, we do have H5P, but it is installed at the "admin" level and not the "course" level. The instructions for setting up the integration at the "admin" level are located at:
Setting up H5P.com in Canvas (LTI 1.3) – H5P
I'd defer to others here in the Community if they have been able to successfully use H5P at the "course" level, but this would assume that no initial setup at the "admin" level was necessary.
Sorry that I don't have better news for you, but I hope this helps in some way.