Here is a step by step guide on how to publish 123 Form Builder web forms on Wix:
How to use the 123 Form Builder. The 123 Form Builder app for Wix could appear complex, but once you get familiar with it, you should publish web forms fast and easy. The 123 Form Builder is the place where you can:
Click on My Forms tab to run through your existing forms, Templates to create a new form using one of our predefined templates. To publish your form on the current Wix webpage from the My Forms section, click on the link Publish on Wix or hit Publish elsewhere if you want to publish the form somewhere else.
You’ll see which form is selected in the Selected Form window on the right. You can edit the form at any time by pressing the Customize Form button. It will open the Form Editor in a new window.
To access your 123 Form Builder account through the Form Builder, click on the link My Forms to view your forms, My Account to manage your account information and Support if you require assistance. If you want to log out, use the link on the top right corner.
To select a theme for your form, click on the arrow next to the name of the theme, under Design. This will open a dropdown with a preview windows on the right. Here you can select one of the popular themes used by other people, a predefined theme by 123 Form Builder or one of your existing customized themes. Press on the Customize link (under the preview) to edit the theme or Apply to add that theme to your form.