Talk:Classes/@comment-29448811-20171217152755/@comment-3509554-20171217211250

When you have skill points, click the Up Arrow on the skill you want to level up, whose name is not replaced by ?.

If you want to unlock a skill that is still unknown (It's name is hidden by ? marks), pass the mouse over to see the requirement to unlock it.

In case the skill is not a passive, you have to drag It's icon to one of the four slots that appears above the mod hud in the inventory, they appear right above the Class window.

The slots are respectivelly F1~F4, from left to right, just tap the respective key and the skill will be used.

Passive skills doesn't need to be assigned, they will be on effect all the time It is unlocked.

Pay attention If you are not on Action mode, or else the skill window will show the classes are indisponible on action mode, In case It is indisponible, go to the game main menu, click N Terraria Options on the bottom of the screen, then click Action mode button to toggle the game mode.