I know nothing about hair but I really would like to have my hair a pastel pink or lavender color like this

It's something I have wanted for a long time but I've never known how to do it. I have medium brown hair that has been dyed a dark red color.

What steps would I need to take to achieve this goal?

I only have a Fantastic Sams around me no place that does crazy colors so I would probably just be able to get it lightened there