The START autofarm button can be found at the bottom, on the system tray.
To the left of it is a small Autofarm Settings button.
Radius - maximum 3000, with or without zone.
Phys. attack or Mag. attack choose from the class of your character.
4 panels for skills - you can move the mouse there skills from the skills window (Alt+K),
or transfer them from the Skills panel.
Reuse - the time to rollback a skill in seconds.

Spoil settings: spoil customization.
2 panels for skills:
fist attack - Apply the skill when the mob is alive (e.g. Spoil Festival).
mob died - Apply skill when mob is dead (for example Festive Sweeper).

AutoPotions: ACP customization.
3 panels for hits: HP, MP, CP.
ACP can also be turned on without autofarming, using the key combination Ctrl + Shift + A

Autofarm does not take in targeting raid bosses.

If autofarm does not work, run the client as administrator.

IMPORTANT: if the mage jumps targeting without killing the previous target, or hits with a stick, then
check the DelayFirstAttack=350 setting (default, in ms) in the OptionEx.ini file in the System folder.
If you are a fighter and only hit with a normal attack, you can safely lower this value.
Mages can also lower the value, it depends on your ping. Experiment.