Once you successfully Added Modules from the Module Builder, you can enable the Modules from the Module Configuration. 
You will get the list of the modules related to contact and account.
You can search the “Modules ” and “Portal Modules” by inserting the Module name in the search box.
You can simply drag and drop from the Modules column to Portal Modules to enable the particular module for the Portal. Similarly, if you want to disable any module, you need to drag and drop from “Portal Modules” to the “Modules” section. 
After configurations, click on the Save button at the bottom to enable the modules for the Portal.