If it’s during the daytime hours there is normally a “Club Level Check-In” station directly to the right when you walk in the main lobby. They will either do some basic check-in stuff there then walk you over, or walk you over right away. If that sign is not up, you can either wait in a regular check-in line or walk over to Hawaii yourself. When going to Hawaii yourself I’m 50/50 with your bands (assuming you have them) actually working to open the doors - so it can be a little awkward standing there without being able to open the door hoping the CMs see you and take pity on you to let you in (they usually do).
If you see a greeter or manager type person anywhere out front or in the main lobby, I’d let them know you’re checking in CL.
Hope that helps!