View your account's private key.

If you want to use the same account on different browsers or computers, you will need this private key.

Never make this private key public, and keep it in a place where others will never find it.
How to display from the Wallet itself
Click on the Extension icon in Chrome to display Wallet, and click on the "Account icon" in the upper left corner of Wallet
When the account list screen appears, click on "...".
Click "Edit Account...".
Click on the "eye icon" of the private key
You can check your private key.
How to add it from the settings screen
Click on the Extension icon in Chrome to display Wallet, and then click on the "gear icon" in the upper right corner of Wallet
Go to the settings screen and click "Account" under "Wallet
From the list of accounts on the right, click the "..." button to the right of the account name you want to view the private key for.
サブメニューの「秘密鍵を表示」を選択します
Your private key will be displayed.