.Map :: MoHAA Mapping

I am new to making rooms and read the Surgeons tutorial but I can't seem to find the chalk anyway.

So, go up to the texture list and select common

I went to texture, which is next to grid and misc all I can find is Reload, show in use and surface inspector etc.

Am I in the wrong place? Hope some ...

I am new to MOHAA Editing and I have download the full file from the offical site

When I try to open the zip file I get the following M410.scr and my screen saver opens but I can not see any tools for editing my own mission

How should I go about open the editor?

Thanks