U have to purchase a Linkshell, in the game, i forget the location, i know in Windurst its in port. Then u have to name your LS and pick a color for it. U can make other members able to carry a pearlsac so they can invite members too. Give them a pearl, then goto the linkshell-link list, highlight the name and upgrade the pearl to a pearlsac. I will find out the details and edit my post to provide more info. From the pearlsac u can hand out pearls to members u want in ur LS. U cannot sell them, or deliver them. U have to trade them (face to face).