How can someone complete the form please help

You can share the link with them via email, just go to edit form, click on Publish >Share on Email

Or if you have a website, you can embed it.

Please follow these guides for further details.

https://www.jotform.com/help/303-How-to-Send-a-Form-via-Email

https://www.jotform.com/help/34-Adding-a-Form-to-a-Web-Page