Hello dear Mark, how are you? Look, you should go to "friends" , then you should choose the person you want to delete. Open his/has page and then go to the "remove from friends" that you can find on the right, under the part "quick introduction". If that person harasses you so much, I strongly recommend you to report that person to Italki with the proofs, so they can know what is exactly his/her fault. The final option is to block a person, so that person can't follow you, add you or communicate with you. Here you are the explanation how can you do that: http://support.italki.com/hc/en-us/articles/206353518-How-do-I-block-a-friend-user- I hope this helps. If you need any help more, feel free to ask me. Have a nice day.

Not from the list of friends.You have to go to that person's profile and you can do it from there.