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There are various ways to create a pull request, but the important thing is to make sure the title includes the Jira number from step 1. E.g., if you created a Jira in step 1 and the number the number was MODCR-1001, then the PR title would be something like 'MODCR-1001 Add new sample data to the Courses app'
Adding the title at the start of the PR lets it be linked to the Jira in the Development accordion, so that when the Jira is opened you can jump straight to the associated github work.
Step 5: Coordinate with the development team to merge the PR and release the change
After your PR is open, reach out to the product owner for the development team via Jira or Slack and ask them to bring the Jira into their workflows so that it can be worked on. Once the development team creates a release that includes your new files, you will begin to see them appear on Snapshot with the next reference environment build.