This is for the Super Carrier and the other is for the free carriers. The frequencies are set up by the mission creator, you can press 'K' I believe and it will show the frequencies. Best to use a ACLS training mission or, if you're feeling adventurous, make your own ( included in first video) and you gain even more understanding of what's going on. Pause the videos after each step and write down the proceedure, it helps. I included the 3rd video because it's got a good visual representation, you can pause the video, take a screenshot of the visual aids and then keep them for your reference. You're basically trying to fly down to a point in space where the ACLS can lock on and remote guide your jet from there. Don't forget what I posted above "When you hear "ACLS lock-on" over the radio and see 'mode 1' on your ACL page then hit CPL on the autopilot to switch, then hit ATC and make sure it engages i.e. not flashing. From there, its hands off and the ACLS will land the jet, works for me every time." It all happens quicker than you'd think so you have to practice the procedure a little. If you still aren't getting it after this, PM me and I'll schedule to get with you and do some practice.
rfxcasey's post in ACLS lands me in the sea? was marked as the answer