First, check if both ConvertFox and Airim's script are copied on your website
Then, from your Airim dashboard, go to "Settings" -> "Contact Options" and select "Live Chat"
Select ConvertFox from the Chat applications list and click 'Activate' to enable the integration.
Paste the following code snippet just below the ConvertFox js snippet. This will ensure that ConvertFox widget is hidden when minimized and Airim widget is shown again.
Your users will now be able to view ConvertFox widget when they click the chat icon from your Airim widget.