Starting a Party
To invite another character into a party one may right click the desired character and then left click 'invite party' in the pop-up menu. Also, one may select a desired character and right click the 'party' icon, or press the corresponding shortcut key-combination (no default). If the desired character is already in a party, this will be indicated in the notifications area.
In every party there is a leader, indicated with the crown on thier tab, or if you are the leader the crown will be in the small circle above and to the left of your picture. The party leader, by default, is the only one who can invite new members, or ban current ones. If the party leader chooses, she may enable 'free selection' which allows any member to invite new ones. The leader may also assign a new leader, by right clicking the new leaders tab and selecting 'assign party master' from the pop-up menu.
Any party member may leave a party by right clicking thier own status block and selecting 'leave party'.