On user talk pages, all you need to do is edit the page to leave a message.
So, to leave Aggelakis a message, you'd go to
User Talk:Aggelakis, click the "edit" tab, and place a message on the page.
You'll probably want to create a new heading related to the subject of your message and place the text under there. For example, in this case you might insert the following at the bottom of the page:
== Thanks for the fix ==
Thanks for fixing the redirect page for me , Im still having trouble understanding how to use this. -~~~~
The "~~~~" at the end of the message will substitute your signature (your username by default) when you save your edit.
So, the above example would come out looking something like this:
Thanks for the fix
Thanks for fixing the redirect page for me , Im still having trouble understanding how to use this. -KAKTOS