Help post, how to change the details of steam account?

Click on the steam wallet in the upper right corner and change the store country/region on the right side of the first column.

You need to pay attention to prepare relevant documents (such as local bank card receipts) to prove that you have studied abroad or immigrated to a new area.

If you want to discount in the low-priced area or cross the area to lock the game.

I don't encourage you to do this. G fat is not stupid. If you play with your account, you will be banned by G Fat.

If you mean changing the download area

Right-click the steam icon in the lower right corner and find the Settings-Download-Download area.

There is no risk of violation in this operation. Need to restart steam.