Syntax Highlighter for CK editor

[Connie]

first read the docs at ckeditor.net about plugins

you will see they must be installed into a certain subdirectory of CKEditpr
Check if the plugin is not already there (there are a lot of already)

then it must be activated
As I am just testing the CKEditor in GS, I am not sure whether it is possible to add this in the EDITOR-Options in the gsconfig.php or whether it must be done in the CKEditor-Configuration itself (which will be overwritten by every upgrade)