How to use Instant Backgrounds to generate AI backgrounds

How to use Instant Backgrounds (ex- Magic Studio)?
Add an Instant Background
Replace a background with an Instant Background
Change the size or position of the subject before using Instant Backgrounds
Create your own Instant Backgrounds with custom prompts
Prompts for generating clothes on a body
Prompts for adding mannequins
Prompts for resizing objects
Regenerate an Instant Background
Blur on Instant Background after moving object
Remove parts of an Instant Background
Prompts for placing jewellery on human