In order to modify a piece of equipment, all you have to do is :
click on "equipment" in the bar on the right side of the screen
click on the equipment you wish to edit
once the equipment page is open, click on "edit" at the top right of the screen
select the information you want to change
click on "Save" at the bottom of the page when you're done
If you wish to export your maintenance to an Excel file, just click on "export" in the top right corner of the screen.