I’m currently using Version 0.9.8 of WP-Syntax. I thought I would quickly go over its usage. To use WP-Syntax just switch over to HTML mode from Visual mode. The reason you need to do this is because Visual mode will escape out our <pre> code. Also, if your code contains any &, <, or >, you will need to stay in HTML mode for the rest of the post, otherwise if you switch back to Visual mode, some of your code could get double escaped and not work. (i.e. &, <, or >). It might be easiest to write your post and add the code at the end.
There are 3 main options.