In your Strikingly account, access the editor of the webpage where you want to add your online form. In the Editor Panel, click on Add New Section, Advanced and then on App Store & HTML.
Once the section has been added to your page, click on Edit and select the HTML app from Strikingly (in the All Apps or Pro tab).
You’ll notice that the web form is displayed on your web page, although its canvas might not expand to its original size. However, that does not mean the same will appear for your page visitors. Hit Preview in the Editor Panel and you’ll see the web form is smoothly displayed.
From now on, your page visitors can submit the web form directly from your Strikingly webpage. Don’t forget to save changes to your webpage before leaving, of course. All form data will be sent to your 123FormBuilder account, in the Submissions section of your web form.