Every amoCRM account has a unique API key which you need to use to integrate it with Hoversignal.
Click on the picture in the upper left corner:
Click on "Profile":
Copy your API key:
Then visit "Integrations" page on Hoversignal:
Choose amoCRM, enter your account address and login in the fields, paste your API key and click on "Save":
Select the widget and click on "Edit":
Move to the "Integrations"(1) tab and activate the integration(2):