Deleting a skill

I would like to delete a secondary skill from the list of skills available for a profession and individual characters. Background is that I had first renamed "Diplomacy" to "Diplomancy and Influencing" (I feel that Rolemaster lacks a clear "Influencing" skill), then changed my mind and created an "Influence" skill separately from "Diplomacy". Now I have three skill entries , "Diplomacy", "Influnence" and "Diplomacy & Influence". I however only want to have the first two.

How can I delete a skill from the "Skill" menue, from the list of skills available for each profession and from players' individual skill lists?

Select the Edit List button at the bottom of the Skills list.
https://i.imgur.com/GZm38mq.png

From there, click the trash can symbol for any skills you want to delete (trash can symbol will change depending on if you have any themes loaded).
https://i.imgur.com/dsJ9M45.png

Click the Edit button again to turn off Edit Mode.

Super. Thank you very much for your answer. Very helpful.