Step 1: Data Connection
You'll be expected to signup for either Power My Analytics or Supermetrics trial.
Step 2: Blank Dashboard
Please create a blank Google Data Studio dashboard. This must be done by yourself because you'll be the only owner of the dashboard. The ownership can't be transferred.
Step 3: Access
You should give Power My Analytics and Google Data Studio access to connect@northstaranalytics.co.uk account. If you signed up Supermetrics you should connect it with Google Data Studio since the trial has only a seat.