Can't start Mac with High Sierra Update! Help!

I installed the new Mac OS High Sierra yesterday.

Today, when I restarted my Mac, boot runner starts up but OSX is missing from the options - only Bootcamp is there!

How do I get into OSX?? Is there any way to disable boot runner?

Thanks

Start up while holding the shift key. This covers the process:

https://support.twocanoes.com/hc/en-us/articles/115004780923-High-Sierra-Boot-Runner-2-Support?mobile_site=true