How can I train tier 2 skills?

[等我有大 你忍一下]

Hi guys, I play the game first time yesterday. Can someone tell me how can I unlock the tier 2 skills? The icons r gray and there is a litter lock on each of them.

[Muffinslop]

You need to upgrade the building in the town hall to unlock each tier.

[等我有大 你忍一下]

I muff and I huff a écrit :

You need to upgrade the building in the town hall to unlock each tier.

Thank you so much.