If you want to send private messages to other Land of the Sun'user, you can do it simply by clicking on the link "Messages" in the bottom of each page. You will be redirected to this page where you can see all the messages received, read, delete them and respond. You can also mark messages ar "read" or "unread".

When you receive a new message, it will be reported in the link "Messages" in the right-top menù of the page that will become "Messages (1 new)". From manage page of your account (see this post to learn more) you can choose if receive by email (the address used for registration) a notification for new private messages on Land of Sun.

Above the message list there is a link "Write a new message" from which you can send a new message to a user. In the new message you must enter the recipient (field marked with a red asterisk); when you start writing the recipient's name, the site will suggest you the names of available users. Multiple recipients are also allowed by separating the names with commas.

It's possible to send a new mail message with the link "Send a private message to this user" located in the profile of each user. To access to an user profile is enough to click on the user's name wherever it appears (in a comment,. in the ranking, etc). 

From the management page of messages you can also block a user and see which are already blocked. Click on "Blocked Users" you entered in the page where there is the list of  users already blocked and where you can add new ones. For more information on blocked users go to the appropriate forum post.