Just frame the text and click on the superscript.
I will demonstrate the detailed steps below:
(Computer model: MacBook Air, software version: Word 2021)
1. Open Word and frame the number that needs to be marked;
2. Click the superscript above;
3. The operation of adding a number to the upper right corner in word is completed!
The above is a tutorial on adding numbers in the upper right corner of Word. I hope it will be helpful to you~