Hi, Mark - welcome to IIS.
The method you want is termed "EQ North/South Alignment" in Michael Swanson's excellent but somewhat outdated
The NexStar User's Guide book. If you PM me your email address, I'll send you a scan of the relevant couple of pages.
First thing is, you need a wedge - does your mount have this built-in? If not, they can be bought separately for $399 for the 6 & 8SE from
Andrews.
There's also an online video here:
Polar Alignment for Wedge-Mounted Scopes