I have Jira Software and Portfolio as a trial and have configured my epics, tasks, etc. I am unable to find anywhere to create releases though. Apparently these are needed in order to visualize my plan against the timeline.
The page includes a demo video with the steps and example on the process.
Alternatively the Versions can be created on the jira side and will be included into the plan, details on creating a Version for a release can be found here: