The Report page builds a printable gas report for your site. You choose what goes in on the left. The preview on the right shows the report exactly as it will print.

The What goes in panel on the left holds every choice. The preview updates as you change them.
The report opens with a summary, What this covers: the period, the number of points, the number of readings, and the groups and levels included. The map follows under Where, then the tables of readings.
On the map in the preview, choose the background: Satellite or Street, and an orthophoto by its date, or No orthophoto. The PDF uses the same background.
A long period with many points can take a moment. If the report is too large, narrow the period.
Save your choices when you make the same report again and again, for example every month. A saved report keeps all the choices on the left, including the period. It does not keep a copy of the readings: it reads them again each time you open it.
For next month's report, open the saved report, change the Period, and save it again or use Save as….
To save:

Click Saved reports to see the list. It shows your own reports and the reports others have shared with the site. A lock means only you can see it; a group icon means it is shared.
Click a report's name to open it.
On your own reports, the pencil lets you rename or share the report, and the bin deletes it. Deleting a report only removes the saved choices. The readings stay.
When a saved report is open:
If you open a report someone else shared, Save makes a copy of your own. Their report stays as it is.
You can also share the address of an open saved report with a colleague. They can open it if the report is shared with the site.