Head over to your hubspot account.
Click on settings, Api Key and then copy your API key
Once done, copy your API key and then paste it in the integrations section of Smartwriter
Select Hubspot and then paste in the API key you've copied from Hubspot, Name the API key so you can easily identify it (name it whatever you want)
Head over/back to your personalised icebreaker file and click on "Push Data"
Select your Reply campaign you want to add the leads to.