How can I make changes to a draft based on comments?

In order to make any changes to the body of the draft which links to comments, you need to switch from Comments mode to Editing mode by allowing the Full-text editing toggle bar at the top of your draft:

Note: You cannot make changes to the body of the draft while being in Comments mode. 

When you are not in the Comments mode, the comments icon will indicate how many active comment threads there are currently in the draft:

If you share the draft, the recipients will be able to see your comments, reply to them or add their own if they are given the correct permissions.

Whenever someone makes a comment in a draft that you own, you will get a notification both in-app and through email. 

Once the draft is turned into a contract by initiating the signature process, comments will no longer be visible to the signees.