For the purpose of this example, let's assume that you want to:

• Allow self-registration (automatic signup) of new users in your 'Customers' directory via Jira, and
• Disable self-registration via Confluence.

Here's how you would set the directory-level and application-level permissions in Crowd.

1. At directory level, enable the 'Add User' permission (and any other permissions you want):
   1. Log on to the Crowd Administration Console.
   2. In the top navigation bar, click Directories.
   3. From the drop-down list, select the Customers directory.
   4. Click the Permissions tab.
   5. Select the Add User.
      
2. At application level, make sure the 'Add User' permission is enabled for the Jira application:
   1. In the top navigation bar, click Applications.
   2. Click on your Jira application.
   3. In the application screen, click the Permissions tab.
   4. Select the 'Customers' directory.
   5. Select Add User.
      
3. At application level, disable the 'Add User' permission the Confluence application:
   1. In the top navigation bar, click Applications.
   2. Click on your Confluence application.
   3. In the application screen, click the Permissions tab.
   4. Select the 'Customers' directory.
   5. Deselect Add User.
      

In summary:
With the above application permissions, a person will be able to sign up for a user account via JIRA and this user will be created in the 'Customers' directory, but they will not be able to sign up for an account via Confluence.