Nothing
In addition to the typical steps to establish a project,
make sure the plugin on your test server is updated to the correct project_id
value in the delete sql.
The sql is in wipe-project-redcapr-arm-delete-single.php.
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.