You may want to unsync your 18R controller from firing modules if you reached the maximum addresses (ER50), or you want to organize the module address starting at A00. This FAQ document will go over the process for all firmware versions.
To unsync your modules from the 18R using firmware version 3.0 and lower, hold down the SYNC Button for 15 seconds.
To unsync your modules from the 18R using firmware version 4.0, hold down the SYNC Button for thirty (30) seconds.
To unsync your modules from the 18R using firmware version 5.0 and higher, hold down the CH- and CH+ buttons for 30 seconds.
The SYNC LED will flicker momentarily when unsynced. Re-start your remote and you can now begin to re-sync modules starting at address A00.