Add label to one page

Paperwork
1

I have scanned 51 pages in a row. Now I want add a label to one or two pages. How can I do it ?
I have tried using “Edit” of the page, but I can add any Text to the page.
Or can I add the Label in the page.5.words file ?

2

Labels are on documents only. Not on pages. (same for “additional keywords”)