By selecting the Global rules element of the Navigation Pane you open the global rules configuration form.

Add rule |
Adds a new global rule to your account. |
Edit rule |
Edits a selected global rule. |
Copy rule |
Copies a selected global rule within the current and to other accounts. |
Delete rule |
Deletes selected global rule. |
Up & Down buttons |
Increases / decreases the position of the global rule in the rule list. The position defines when the rule will be applied to a message. (topmost is the first). |
Global Rules |
Lists all applicable global rules. You can enable or disable them by checking or un-checking the list entry. To edit a rule double click on it. |
Please note that global rules are always applied prior to account rules.
Please note that any changes you made will be applied only if you push the 'Save settings' button.