If the stylus broke then you can replace just the stylus that snaps on and off the cartridge, not the entire cartridge that attaches to the headshell.

Or upgrade the stylus from conical tip ATN91 to elliptical tip LP Gear CFN3600LE.

If you are having problems installing the replacement cartridge you may be best off sending the turntable back to Orbit to have them install the cartridge and they will also align it properly.