Navigate to your Course and scroll down to the Sections section.

Click on the down arrow before the Title and select Edit 

Scroll down until you see the category Contact Person/Indtructor(s)  
If there is not a name listed next to the Contact Person/Instructoror(s) scroll down and click the Save button.

After the page refreshes scroll down and click the Instructors button.

Search for the User that will be responsible for taking attendance and issuing credit. 

Click the check box next to the individual that will be the instructor then click the Add User(s) button.