How to Remove email from POP Server after Receiving It

Having set up a POP3 email account within WIN 10 Preview, 10565, I'm unable to locate how to remove a received email from my provider's server. I'm prepared to hang my head in shame if it turns out the solution was really before my eyes, or is otherwise trivial. Any suggestions?

Like you I haven't got a bloody clue ! Such a bad app. Thunderbird for me.

I haven't figured it out either. I have to go into the server via web browser to delete them. Very annoying. Haven't figured out how to get them to delete from Android email programs either.