there is no ingame menu for the options yet, you'll have to edit the iris/data/config.lua file with a text-editor.
Code:
gUOPath = "C:\\Programs Files\\Ultima Online\\"
or similar, depending on where your uo folder is,
also has to be in iris/data/config.lua
iris doesn't modify your uo installation, you install iris in a seperate directory, and just tell it where to find the your uo installation, so it can load the data.
razor,uogateway and similar tools cannot be used with with iris.
uogamers is already configured for iris, you should find it in the mainmenu when you start iris.
to add other shards, add a block like this to iris/data/config.lua (replace someshard.com by the hostname, and maybe adjust the port as well)
Code:
gShardList["someshard"] = {
gLoginname = "", -- Loginname
gPassword = "", -- Password
gLoginServerIP = "someshard.com",
gLoginServerPort = 2593,
gServerSeed = hex2num("0xFFFFFFFF"),
gPolServer = false
}