To unfollow someone, which will remove their posts from the 'Following' tab in your feed:

1. Go to the profile of the person you'd like to unfollow. 

2. Then, click the ‘Following’ button and it will prompt you to unfollow.

3. Click ‘Unfollow’ to unfollow that account.

OR

1. Go to the ‘Following’ page by going to your ‘Profile’ 

2. Click on your ‘Following’

3. Click the ‘Following’ button on the account you want to unfollow, and it will prompt you to unfollow.