To embed a static individual record, you need to add its ID in the embedding script.
1. Copy your form embed script.
2. Add the record ID manually.
If you would like this record to be changing dynamically, then this is a functionality that you'd need to build on your website, not miniExtensions. To make the record ID a dynamic variable when the form is embedded, you'd need to pass the user's unique value inside the embedded script on your page. The form can't automatically integrate with your website system without some custom work.