Before reading this, I suggest you read these two blog posts:

Active Forums can create Active Social journal items two different ways. The first one happens when a user creates a forum post via an Active Social group journal. The journal item will be created in the group activity tab. The second occurs when you have AF integration enabled, and a user creates a forum post via the standard forum interface. It will create a journal item on the user’s profile activity tab, and also the site summary. Both methods can be enabled simultaneously.

Group Journal: (Skip steps 1-3 if you already have Active Social groups with forums that display correctly in the discussions tab.)

1.       Navigate to Active Social Control Panel > Groups > Global Group Settings and make sure that “Yes, group forums will be automatically created.” is selected. Choose a forum group from the dropdown list, and Save. There is more information about this step in the Getting Started guide, and the admin documentation.

2.       Create a new Active Social group, which in turn creates a new forum.

3.       Exit the control panel.

4.       Navigate to the Active Forums Control Panel > Forums > {Name of forum group that contains AS Discussion forums} > Features > Active Social Integration (On) > […]

5.        Select a Journal Security preference, and check the box if you do not want replies to create journal items.

6.       Save.

7.       Navigate to Active Forums Control Panel > Settings > Community Options > Profile Type.

8.       Select the Active Social – Social Profile page.

9.       Save.

10.   At this point, whenever a forum topic is created via the Active Social group discussions tab, it will create a journal entry in the group activity tab. Forum posts that are created via the Active Forums module will not create these journal entries.

Profile & Summary:

1.       Navigate to Active Social Control Panel > Journal > Available Journal Types

2.       Click on Forum Topics.

3.       Click on Access Control.

4.       Enter “Active Forums” as the Application then click Add.

5.       Copy and paste the Access Key to notepad.

6.       Repeat steps 1-5 except for the Forum Replies journal type.

7.       Make sure there is a check mark next to Forum Topics and Forum Replies in the Profile and Summary columns.

8.       Navigate to Active Forums Control Panel > Settings > Community Options > Active Social Integration

9.       Enter the two different keys that you copied into notepad. Make sure they correctly correspond to topics and replies. Make sure there are no leading or trailing spaces.

10.   Save.

11.   Navigate to Active Forums Control Panel >  Forums > {Name of forum or group you wish to integrate} > Features

12.   Enable Active Social Integration and check the sub-options […]

13.   Save.

14.   Repeat steps 11-12 with all forums that require Active Social journal integration.

15.   Navigate to Active Forums Control Panel > Settings > Community Options > Profile Type.

16.   Select the Active Social – Social Profile page.

17.   Save.