BDD implementation of the rails rspec requests example: how?

Question

Ruby on Rails

The algorithm of the feature is as follows:
1. The user goes to a specific page
2. Clicks "Create a request"
3. A popup appears with a request form (fancybox iframe)
4. The user may not enter all the data (or incorrect data), after which the application fields are highlighted red.
5. The user can enter the correct data, the request will be sent, the popup will close, a dynamic alert will appear on successful submission. Tell me the
algorithm for implementing such a check.