I don’t believe you have a high enough post count to send a message to a member. 7 more should get you there!
On the BLACK bar under the RED bar at the upper part of the page to the right you will see 3 icons. Move your mouse over the center icon that has an image of 3 heads. At the drop down click on Member search .Put in his user ID and then state then click search.
Yep, as Budget36 said, you need to get to 10 posts before the system will allow you to send messages to fellow members. Once you have 10 messages, you can hover your cursor over their avatar image and then click Start A Conversation.
And here is the opportunity for op to get up to 10 posts by thanking those who responded for their help. Hello Hello Hello?