This FAQ will go over the steps of joining a guild, and what the differences are between being a member of a guild and being an officer/owner. Enjoy!
TO JOIN A GUILD:
Any guild invites you receive will appear on the right-hand side of the screen. Click "accept" to join the guild.
Once you've accepted a guild invite, the Guilds button will appear in the upper left of your main HUD.
Clicking the "Guild" button will open up the guild panel. The default tab is the "Info" tab, where you can view:
Guild Level: As you and your fellow guild members earn GP by defeating enemies, you'll also increase your guild level, which give all members of your guild permanent stat bonuses. (More on guild levels and rewards below.)
Motto: This field can only be set by the guild owner.
Message of the Day: This can be edited by the guild owner as well as guild officers. Use it to update your guildmates on the latest guild news.
Guild Ranking: This is the ranking of your guild compared to other guilds. Click the "Leaderboard" tab for more information on your guild's ranking.
Daily Guild GP: This displays the amount of guild points (GP) you've earned for your guild today. GP are equivalent to XP earned by your character. The amount is capped at 25,000 GP daily. If you want, you can also purchase your allotment of GP for the day with gems.
Next Reward: This shows progress toward the next permanent stat bonus for your guild.
Leave Guild: If you leave your guild at any time, you'll lose all GP progress and reward boosts.
The members tab displays information about all of the people in your guild -- their name, level, rank (owner, officer, member), online status, daily GP contribution, and score (a cumulative total of GP earned while in the guild). You can sort by any of these columns by clicking on the labels. The guild membership levels are:
Owner: The guild owner can modify the guild motto, create a message of the day, change the guild emblem, promote members to officers, demote officers to members, transfer ownership to another member, invite new members, and accept or deny prospective invites.
Officer: Guild officers can create a message of the day, promote members to officers, invite new members, and accept or deny prospective invites.
Member: Guild members can participate in the guild but not many any administrative changes to it.
The rewards tab displays information about the guild rewards your guild has unlocked. Every time you or a member of your guild kills an enemy, you earn GP that contributes to the guild level. Whenever the guild reaches a new level, a permanent stat boost is unlocked.
The Top 100 tab displays the global guilds leaderboard, ranking your guild against other guilds. Your score is the cumulative total of guild GP earned by all players in your guild.