The instructions for creating a new skin are incorrect:-
1. Instruction 3 says
Delete the _main.php file and the custom.css file in the myskin folder.
There are no files of that name! The custom folder contains:- _item_block.inc.php; _skin.class.php; index.main.php; item.css; skinshot.png; style.css and a folder called img.
2. Instruction 2 says
Now you have a working skin. You can check it out by changing the default skin for your blog in the backoffice to myskin. Now view your blog. It looks just like the custom skin now.
This produces an error:-
There seems to be a _skin.class.php file in the skin directory [myskin], but it does not contain a properly named class. Expected class name is: myskin_Skin
Could someone please give me the correct instructions?
You are reading an old manual. Simply edit any existing skin. Basically you can copy any template file from /skins/ to /skins/yourskin/ and edit it.