Guild Profile Tab
You can change the Guild name and avatar by clicking on the edit profile button
You can change the Guild description by clicking on the Edit description button.
Remember that this is the Guild "business card". This is what players looking for a Guild will see so make sure that what you write there is interesting if you want to attract new members
Guild Members tab
This is the member list. you can grant or remove rights from each member by clicking on the associated icons in front of each name.
See Guild rights for more details
Guild Administration Tab
Only Founders, Leaders and inviters can see this tab.
Here you can see who has applied to your guild, send out invitations and change the way that the guild acquire new members