How do I remove spam messages in Freelance UK?

I have sent several messages to the tech email over the last 3 months, with no response. Does anyone know how to delete spam messages?
Thanks!

 

Hello,
I am new on the site and I haven't received or sent any spam messages yet.
I think we cannot un-send or delete any message from our sent items. You
should not spam any client as it may have a negative effect on your profile.

 

Hi, I don't think you understood my question. How do I delete spam messages which someone else is sending to me ( advertising)? I am not spamming anyone else. Why do you suggest that I am?

 

Hi,
Sorry I have misunderstood your question earlier. As stated in my previous message, I haven't received any spam messages yet. However, I think you cannot delete the spam messages from your inbox.