Displaying Send (or Submit) button in-line with a text filed

Ho can I display the Send (or Submit) button in-line with an input text or email filed? The form needs to allow the user to enter only an email address and be able to press the Submit button to the right of the text field on one line: [email] field => Submit button
This is where I am trying to do it:
https://www.brilianti.com/#/tiffany-co-platinum-and-diamond-pave-heart-pendant”>