You have 2 ways to top up~

One is to use Web Top up~

Tap to Web Top up page

One is to use APK Top up

※Here is tutorial for APK Top up

APK Top up steps

1. Tap「Shop」at the upper right

2. Tap【Top up】at left and tap【Go to Top up】

3. Check your【Account】,【Server】and【Character Name】you want to top up.

4. Choose the way to top up.(This tutorial uses Razer Gold Wallet as an example, you may use other ways to top up.)

5. Tap Razer Gold Wallet and choose item to top up and tap Next page, and enter required info.

6. Congrats! Top up successful! Close the【Shop】and check your ingot.

7. You will see the ingots increased. (Slow internet speed may cause a delay, you can tap【Check Order】to solve the problem!)