You can click on my name and you will have an option to send a private message. Or you can go on your profile, and there is a section for private messages.
Hope it helps
Ffs, click on Nohos. Name in blue in one of his posts, profile page opens and blue and white box in top right, small grey speech bubble icon lower right of this box. Click on this, type your message, click send. Message will stay in your outbox until Noho opens it.