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Install app

Directly go to this link: S: Contact Form - Contact Us to install the app.
After adding the app to the store is complete, you need to embed the app in the theme:
Go to Integrate Theme from the left sidebar -> Select the theme you want to apply -> Click the "Go to Theme Editor > App Embeds" -> Click the Save button in the upper right corner.
If you want to preview the application on an unpublished theme, then follow the same steps as above.