Are you looking for a course you can take on how to make a course available for your users to self-enroll?
You might find the information in this Docebo U course: https://university.docebo.com/learn/courses/294/managing-courses?hash=d517ddfffc84aef4715189ca03a774ca37999773&generated_by=69225

Or are you looking for a resource from Docebo that you can share with your users to learn how to enroll?
There is a learner guide avaialble on the Docebo Knowledge base: https://help.docebo.com/hc/en-us/sections/360005441760-Learner-guide

did you check on Docebo University?

I did, I was not able to locate a course. I thought I had seen one, but could be wrong. 

Because there are different ways to access a course, they may not be that explicit…

here are a couple resources you might find helpful:

https://help.docebo.com/hc/en-us/articles/360020125819-Accessing-Your-Courses-and-Learning-Plans

https://help.docebo.com/hc/en-us/articles/360020084340-Managing-self-enrollments-and-waiting-lists

I know I’m a little late but thought I would pass on my experience.  We have a FAQ document witin Docebo and I keep as a pdf and send it all the time.  I just add the easiest way and then put it in the Help section of our platform.