Click on the gear icon in the top right once logged in to hubspot.

Add the following permissions: 
crm.lists.read
crm.objects.contacts.read
crm.objects.contacts.write
crm.schemas.custom.read
crm.objects.companies.write
crm.schemas.contacts.read
crm.lists.write
crm.objects.companies.read
crm.schemas.companies.read
crm.objects.owners.read

HubSpot is a CRM platform. Learn how to effectively use HubSpot to manage your customers and other tips and tricks such as how to merge contacts or how to connect your Gmail account.

Hubspot Integration