Auto-renewal

I have auto-renewal for my Norton 360 subscription and have 41 days left.  I need to add my new laptop now, but have read that it's too late for this subscription.  Must I renew my subscription now instead of waiting?  If so, do I need to turn auto-renewal off first?

 

Or, can I specify auto-renewal to renew now?  I prefer auto-renewal because I usually have some type of problem when I do it myself.

 

For future reference, how does auto-renew work for 2nd PC at expiration time?

 

I appreciate any help you can give me.

 

Bev