Need Help With A Folder 301 redirect


I’m trying to redirect an old url folder to a specific new url page in a new folder.

the old url is /rentals/houseboat-rentals-in-texas
the new url is /blog/houseboat-rentals-in-texas

I try redirect like this Screenshot_7|690x50 but it’s 404 error

Any help would be great and thanks in advance