1. First, open WeChat on your mobile phone. First, click the "My" option in the lower right corner, and then click the "Settings" option on the page that opens.
2. Then click the "General" option below in the opened settings page.
3. Then in the General page that opens, click the Multilingual option below.
4. Finally, in the "Multilingual" page that opens, you can see that there are many languages to choose from. Click the traditional Chinese below, and then click the "Save" button in the upper right corner. The setting is successful.