Once you've installed the app, open any Google Sheet and launch Airboxr.

You can find it under Add-ons → Airboxr → Launch.

Choose Import

On the Home Screen, click on Import.

Add Hubspot as a source

Click the Add button next to Hubspot.

Connect your HubSpot account with Airboxr

Click on the Connect Your Account button.

A new popup will open asking you to sign in. Sign in with your Hubspot email and password.