Either turn /autoloot on for the character you want to loot everything and make them ML or you can spend a bit for time creating an individual character loot.ini file that will allow loot to be shared across your team depending on what they need etc. The 2nd option takes a bit of setup time but it’s fantastic.
In KA make sure you have LootOn turned on(1) for the character you want to have loot, and turned off(0) for everyone else. When you startup the group you will notice in the group window who has been assigned as looter. Using MQ2Autoloot is the way to go and works well with kiss.