Open the Wix website editor and click "Add" on the left hand side.
Select "More" and then select "HTML iframe".
A box will be placed in the middle of your page. Click on "Enter code" button and paste in the onWebChat chat code, where it says "Add your code here (HTTPS only)".
If you don't have an onWebChat account, create an account to get the onWebChat chat code for your website.
Click on "Apply" button and close that box. Right click on the box that you insterted in the middle of your page and
select "Show on All Pages" and then "Pin to Screen".
Click on the bottom right or bottom left corner of the image (where you like to place the chat widget) and set "Horizontal offset"
and "Vertical offset" to 0px.
Now close this box and set the HTML box to fit the chat window when it is opened. 500 px width and 550px height, should be fine. Finally click on "Publish" and open your website on a new tab to test onWebChat.