Question: how to change your skin in minecraft while playing?
Answer: Select a skin. Click on a skin that you would like to use for your Minecraft character. ... 
Click Download. It's a button on the right side of the skin's page. ... 
Click ☰. It's in the top-right corner of the page. ... 
Click Profile. ... 
Click select a file. ... 
Select your skin file. ... 
Click Open. ... 
Click Upload.