Welcome to Flyertalk!
When you have upgraded with miles, or have a full award you are treated like any paying Club World passenger (with exception of miles and tier points earned of course!). Enjoy the lounges!
You'll probably be directed to the Lounge Pavilion opposite Gate 10 at check-in but go to the Elemis Spa on the lower floor to book an appointment and head to the Gate 1 lounge instead...and head upstairs.