How to edit Contents in pdf in edge

Actually I got a pdf file today and it's contents are a mess, and the file is way too huge to go through page-by-page to find the required data, is there anyway I can edit the content like:

Chapter - 1

• Be sure to check this page!
• remember this point!

or even like the following would work:

• Chapter - 1
• Chapter - 2

please help me out

I've got the solution for anyone having the same problem as mine, to edit, merge, or split pdfs anyone can consider using 'Wondershare PDFelement' it's a really cool app with tons of features that I found out while searching for solutions for my problem. The app has a really cool interface and you can add, edit or delete bookmarks and save the changes. The free version has limited features and also leaves a watermark but I am ok with it, however you can always buy the pro version.

Thanks.