First, enter the main interface of the game and click Save;

2.

Then in the upper right corner of the warehouse, you can see a tie and a bow. Ties represent male roles and bows represent female roles. If you are a male character and want to change into a female character, click on the bow to change into a female character.

3.

You can buy a female character for 500 gold coins on the first click, which is very cheap. Then, after clicking, return to the main interface and you will find yourself becoming a female character.