How to add a partner user to your Infusionsoft by Keap app
To add a partner user does not take up any of your user licenses. By adding our partner user email, we will be able to better support your application.
1. Log into your Infusionsoft by Keap account. From the main drop down menu, select Admin > Users.

2. Next, select Add Partner in the upper right corner.

3. Finally, in the Infusionsoft by Keap ID field enter "ines@pine3marketing.com" (our partner ID email) and turn the Admin option on. Click Send Email Invitation. We will now be notified that you have added us and will accept the invitation.

Source:
https://help.infusionsoft.com/help/add-or-deactivate-users