How do I set up the widget on my Wix website?
You can set it up by following the instructions here.
How can I have a CTA button on my post?
To add a CTA button to your posts and pages, on your dashboard, go to the Sales channels section, select the channel you want to set up and follow the instructions.
How can I see from the dashboard that ChatFood is already connected to my channel?
On your dashboard, go to the Sales channels section. You will find the status for each channel on the right side of its card.