To enable the CFR 21 part 11 compliance module, go through the following steps:  

Step 1:  In the main menu, on the left side, click Settings.   

Step 2 : Choose the General option.  

Step 3 : Click on the edit option, located on the right hand side of the text "Compliance".

Step 4: Activate the selector behind the name "CFR 21".

Step 5: Insert the frequency, in days, in which you want the password to be replaced.

Step 6: Click on the save option.  

Example of how to enable the CFR 21 part 11 compliance module: