There is a private message function on this forum, enabling members to drop a quick message (like an email) to other members.
Primarily, this is useful for contacting the Administrator or any moderators of the forum regarding any issues, but it's obviously useful too for private discussions between members.
This is a step by step guide on how to use this feature.
1) Hover your mouse over the 'My Messages' button at the top of the page (see image below for example of this)

2) Click on 'Send a Message' - this will take you straight to compose a message (see image below).
3) In the 'To' area, start to type the name of the member you would like to send the message to (you can add more than one member). As you type, that member name will appear in a box below (see image below for example). Click on the correct member name as it appears below, and that member will be selected.

4) Write your message and send as you would do a normal email.
From the 'My Messages' area you can also view your own inbox, send messages, search through your inbox and also change the settings.
If you click on 'Change Settings' you can choose how you are notified when you receive a new message (you can set it to 'pop-up' on screen for example) to your inbox, who is allowed to send you messages, and more.