Hi there,
I'd like to help out with changing the colour on your website for you. I've read through your description and I'm confident I can take care of this without issues. As you mentioned you don't have the hosting login only wordpress, which is fine as I can make the changes directly there.
That being said, I'm ready to start working ASAP on this and can turn it around quickly for you.
Should you have any questions please let me know.
Thank you,
Chris Ryan