Test venues and profiles are not allowed on the live OpenReview site. You can test your venue workflow using the dev site: dev.openreview.net. In order to do so, create a profile and submit a venue request form, just as you would on the live site.
Note that sending emails through the dev site is not supported. If you need to create a profile in the dev site, you will need to request the activation link at info@openreview.net.