Apparel showcase

[Jojoya]

so how do i change the manequin and the accessories in the apparel showcase? it was gifted to me by a friend who is a female and the manequin inside it is also a female. i can craft i am an omni crafter can someone help me figure out how i can change the inside stuff of the showcase ? and the clothes and armor and accessories? i am looking for a step by step guide if possible and also another information is it is placed in my house already.

You can't change what's inside of the themed showcases. You can only customize the plain Showcase.