(101 question) How to associate privs with a module?

1st post, and hope it's the right area..

Hi, realy basic question, as I try to grasp how D365 F&O works.

I've been reviewing some training on security, but it's just not clear to me how to do the following.

I wanted to see if I could create my own role, then a duty, then see if I could assign privileges such that a user could see All of the

customers in the A/R module.(picked that module at random, just for testing)

What I've done so far:

1) Created a role

2) Assigned a new duty to above role(using "Create new and add reference")

3) Created a new priv, using "Create new and reference"

Now, I click the new priv, and I can see under "References", "Action menu items", "Display menu items", etc etc

From here, I'm lost as to how I associate a priv with my A/R customer list?

Any help/direction is greatly appreciated!