It does not add soemthing to the vanilla guild roster.
It got it's own UI! You need to choose the guild there (top left, see (1)) and you can start to roll dices on the guild members list that way, at the FCOGuildLOttery UI.
The results of the dice rolls are shown in a history at the right UI part where the @displayname of the member rolled will be shown together with the date and time (2).
-> See numbers at the screenshot explained at the addon description:
https://www.esoui.com/downloads/info...wshistory.html
If you choose no guild it will just roll a dice and show the history for it.
You can choose the dice's sides at the top left. Default is d500 for 500 guild members e.g.
The main feature is rlling dices on the sold items list of a guild so you can do a raffle or some lottery for guild members based on their sold items ranking of the month/time period choosen -> Depends on LibHistoire data so you need to install that and scan the guild history with it like described at the description of the addon or at the description of LibHistoire or at MasterMerchant and other addons using it. Basically it is: Press G, choose guild, at LibHistoire UI shown there choose e.g. sold items and press E every 2 seconds until the bars at LibHistoire UI are all filled to 100%.
And then jst enable that lib each day and let it scan each day again automatically to fill new sold items/member changes/guild bank changes.
If you login each day or every 2nd it will be fast and automatically. If you disable that lib and only do the scanning every week it will take loooonger if one automatically so you may need repeat the above explained G-> choose guild-> choose suff to update (bank, members, sold items, ava, ...) and manually press E until bars are filled for all your guilds interested in.