We assume here that you previously created a page from a template (refer to this Atlassian documentation for more information) where a Spreadsheet was inserted.
After selecting the template page, the Spreadsheet will be displayed on the page.
In the event where a template page was created for a specific space, only template pages specific to the current space will be available for use.
You can simply click the Edit icon located at the bottom of the macro in order to edit it.
Once you're done editing, simply save the Spreadsheet and close it.