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Using skills will be much easier for you to bring down enemies. After you've learned various kinds of skills, you can select one to use while confronting enemies.

Weapons Skills

Click the 'Skill Selection' button to open the interface.

Left click to select the weapon skill you would like to use, and then right click to use it.

Core Auxiliary Skills

The way to use the Auxiliary Skills is the same as that of the weapon skills'. The Auxiliary Skills you can use are determined by the Auxiliary Programs of the Cores that you've equipped.

How to Set Function Keys

Left click a skill and drag it to the function keys boxes. After that, you can press function keys (F1 - F8) to switch your weapon skills.