...
To use an existing K2A rule:
From the Mega Navigation, select Rules.
Select Actions > Add Rule.
In the Create Rule section, select the Base Rule drop-down, and then select the K2A rule. You can click in the Base Rule field and enter text to search for a rule.
Select the Enabled toggle and select Save to start using the K2A Rule.
...
You can also enable a rule from the Rule Builder dashboard.