To find and change the settings of the game click the cogwheel icon next to the world map button found at the top right of the game window.
There are several settings that can be changed. All settings can be toggled on and off be removing or adding a checkmark in the box in front of the setting. Here is an overview what each setting does.
Music: Mute or unmute background music or change volume by moving the slider
SFX: Mute or unmute special sound effects or change volume by moving the slider
Texture Quality: Improves texture quality throughout the game
Screen Shakes: Enables/disables screen shaking during fights
Apply: Enable/disable players to send you friend requests
Party Invitation: Enable/disable players sending you party invites for raids
Message from Stranger: Enable/disable players not on your friends list to send you messages
Portrait Animation upon Skill On/Off: Enable/disable special skill animations when anyone in a fight uses a special skill.
Language: Here you can change the language of the game from a few supported languages.
This guide is sourced from yabusame.