To use Poodll you will need to have a Poodll subscription (free trial is ok) and your Poodll API user and secret. You can get those from the Poodll member dashboard at https://member.poodll.com .
Create an account and take a free trial if you have not done so yet. I
If you have trouble logging in try your email address as username, or request a password reset.
If you have not registered your Moodle site URL you will need to, so that Poodll can authorize it. Register your URLs also on the Poodll member dashboard.
You use the API user and secret in the settings pages for each of the Poodll plugins on your own Moodle site.
Once you have set the API user and secret on one plugin, you can click the "Set API user and secret with existing credentials" link to auto fill the API user and secret on that page.