Jaap Hollander said
Trying to follow your advice, I am encountering these obstacles:
1. When opening the editor, there is no search box, I cannot find the designated code.
Inline and simple editing windows like those employed by WordPress for themes and plugins generally do not. They are meant to allow quick and small changes. If you really need to search then you can use the browser search – that will find text in the edit window.
2. When copying the text of the theme from the editor to a text editor, the code mentioned in http://codex.simple-press.com/…..mn-widths/ is not found.
Then I am afraid that you must have either the wrong file or you have made a bad copy because it is there. The display can not work without column statements and control. But why are you copying text? If you feel you need to make a copy you should be copying the whole file.
3. This part of the codex suggests I copy the theme and change the code in the copy. Here my question is: how do I do that precisely? Do I copy it in my file manager in CPanel and then rename it and choose it in the S:P available theme section? Or should I do it in some other way?
We recommend that you create your own SP theme so that any customisation is not lost during a future update. (http://codex.simple-press.com/codex/themes/theme-basics/creating-a-theme/)
Most people copy files between their server and desktop PC using standard ftp tools.