Hi there @PastorT ,
In addition to what @chriscas said, I wanted to add on.
If you created your own account back at that time, it sounds like you may have registered with Free for Teacher. Free for Teacher is a free service provided to educators that only provides course-level admin functionality. The feature your looking for only exists at the account-level, which is something only Instructure employees have access to. You are not able to create a new role as a course-level admin only, regardless if you are using FFT or are a teacher associated with a paid instance.
I hope this helps!