Add the account:
Visit the CRM Integrations page.
In the HubSpot section click on "Add account".
Then you will be redirected where you have to accept some permissions.
Click on "Allow"
Match your HubSpot users with Leadsvibe users
Visit the CRM Integrations page.
Click on the account you want to match your users.
Sync your users: On the left you have the users from LeadsVibe and on the right a select with all your HubSpot users.
Once you have matched all your users click on "Save" at the bottom right corner.