Below are the commands and my thoughts on setting up IPv6 on a Ubiquiti Networks EdgeRouter Lite (ERLite-3). Were one to follow this as a guide, the results should be functioning IPv6 on the WAN and LAN side.
Note: As of EdgeMax v1.9.0, most IPv6 functionality is not available via the GUI. But, there is a new wizard as of this release which may work for the most basic case.
EdgeMax software version: 1.9.0 (works for 1.7.0 and above)