Configuration- Free version
Please follow below step to configuration,

Step 1: Go to Typoscript module.
Step 2: Click on Root page
Step 3: Go to Constant editor
Step 4: Select plugin.tx_nshubspot
Step 4: Add Client Id
Step 5: Add Client API
To obtain the Client ID and Client API Key, please refer to the following links:
Pleae follow below steps for hubspot configuration.
Hubspot Configuration
Step 1: Go to Form module
Step 2: Click on Button Create new

Step 3: Create Blank / Predefined Form

After Adding Form,follow below steps:

Step 1: Enable toggle Hubspot
Step 2: Add Hubspot Portal id
Step 3: Add HubSpot Form Id
Step 4: Select Hubspot Finisher Finisher from dropdown

Step 5: Select Form Field
Step 6: Add HubSpotValue of Field from your Hubspot form
Repeat the above steps 5 and 6 for all fields you want to add in your form.
To get form id follow steps showing in linke below:
Add the HubSpot Form Plugin
To configure hubspot Form in your site,please follow below steps,
Step 1: Go to page
Step 2: Open Create Content element Wizard
Step 3: Go to Form Element tab

Step 4: Choose Hubspot Form from dropdown which you want to Integrate.

Save Configurations and use Plugin as per your requirements.