Log in to Sakai as an Administrator.
Navigate to the course needing integration (you may want to use a test course first, if available - steps will be unchanged using a test course).
Select Site Editor on the left side menu once on the course as Admin or Instructor.
Select External Tools tab in the middle of the new page.
Select Install LTI Tool on upper right (under the Help icon).
Launch URL
that you got from AktivConsumer Key
that you got from AktivConsumer Secret
that you got from AktivAktiv will now appear on the left menu. Select it.
Select Add Content on the next page and choose Add External Tool
Select Aktiv from the next page and hit Save in the popup.
The Aktiv external tool link should now show up in the middle of the page. Hit the paper and pencil edit icon on the left of the Aktiv tool.
Under How should it be displayed? Select New Window and Update Item.