Welcome from Huntsville, AL!
Your owner's manual should have a "how to replace" section. But in most cases, you turn counter-clockwise to remove the filter housing.
FYI, Most RV filters are meant to filter out particulate, scale, and other particles - they are not water "purification" filters. Like Wiscampsin, a lot of folks use external filters that filter out more stuff.
My take on filters is they are yet another "decreaser of my shower's water pressure" devices
(especially the ones that claim to purify the city water)
I am not sure I need purified water for my toilet
and if it is going inside our bodies or cooking our food, we use bottled water