Open Fantasy Westward Journey and click the "Carnival" icon on the left side of the screen.

In the carnival activity interface, click the "invitation code exchange" button.

In the pop-up dialog box, enter the invitation code and click OK.

After redemption, you can view and receive the reward in My Rewards.

It should be noted that each account can only use the invitation code once, and it must be used within the specified time. In addition, the invitation code may be valid, please use it as soon as possible within the validity period.