Where is the "Maintenance Section"?

[xander999it]

Operating system

Windows X, 64 bit

Python version

Python 3.7

Problem description

Hello! I am new to this. I uploaded my GTFS files and now I want to truncate 2 of my routes. I went to the "Default Route Sequence" page and clicked on the red X's to delete the stops I want to remove. However I noticed this note at the bottom of the page:
"Note: Shapes chosen here will be saved for future trips to be created; they will not be assigned to all pre-existing trips under this route. To do that, please visit the Maintenance section."

Where is the "Maintenance Section"?, I cannot seem to find it.

Thanks!