Good luck on your Medium journey. It's tough at the start but there are lots of articles that can help, and everyone is very friendly. To change your home page colour have you clicked on your picture,-- Settings--Design--Design Settings--Colours? You are doing the right thing by commenting on other people's work. It is the key to building followers. Happy to help with any specific questions you have, but I still feel like a Newbie myself so may not have all the answers. Thanks for your comment. A🙏💚