Can you change the color of grout on your floor and how easy is it

https://www.thespruce.com/change-tile-grout-color-apply-colorants-1822577

This all depends on how much labor you wish to put in to it. The most labor intensive way is to use a grout saw to take off the top 1/8 th inch layer or all of the grout and then put new grout back in ( like I said this is a lot of work). The easier way is to get a grout color pen and you can basically paint your grout( they come in several colors) just follow manufacturers directions and you should be fine. Hope this helps. Grout pens can be found at HD, Lowes and most Flooring supply stores.

Grout pens can seal the grouting, making it easier to keep clean.

there are grout pens available at hardware stores