Managing Forum Permissions 
Managing your forum permissions is similar to editing global usergroup permissions, but allows more control. If you click Usergroups > Forum Permissions, you will see a screen similar to this:

Here, you will see each forum on your board with a list of all usergroups under each forum. Notice the color key at the top. In this example, red indicates that a usergroup has a custom forum permission specified for this forum, while orange indicates that the group is inheriting a permission from a parent forum. Otherwise, no forum permission has been specified, so the group will be using its global usergroup permissions.

Next to each forum title, you will see 2 links:To edit or add a forum permission, simply find the appropriate forum and usergroup, and click [Edit]. This will lead you to this screen:

These permissions will likely look familiar to you because they are a subset of the options you can specify when editing global usergroup permissions. If you are unsure of what a specific option does, click the inline help icon for more information.
To delete a forum permission from this screen, make sure Use Usergroup Default Permissions is selected at the top of the page.
Jose Amaral Rego 17th Jun 2008, 11:06pm
Nothing is shown about 'Tags' nor is option * and only within per usergroup. I know to go with the second part mention above.

Post / Thread Permissions
Can Tag Own Threads Yes No
Can Tag Others' Threads Yes No
Can Delete Tags on Own Threads Yes No
*Can Create Tags Yes No