Hi, my name is ***** ***** I would love to help you with your question.
Just to clarify, you are using Google sheets and you want to format cells as percentages, correct?
To apply a custom number format to your spreadsheet:
I got this info from here:
If you want to provide me with the link and have me do it for you, I can do that too, just let me know.
If providing the above information was enough and that solved your issue, awesome! In that case I would greatly appreciate it if you could please rate my answer. If you still need help just ask here and I will help.