Within the Knit Camp App, you can turn on notifications for a user by clicking on the FOLLOW button on the profile of who you wish you follow/receive post notifications for. Once you click it, a pop-up at the bottom of your screen will confirm that you have turned on notifications for that profile.
To unfollow or turn off those notifications, simply click FOLLOWING (which was the FOLLOW button).
You can find who you follow by going to your account page (the head icon at the bottom of the App), and clicking on "following" which will show who you are following (see below)
You can also view who is following you on this page.