Tap the Remove Message button in the pop-up menu (earlier variations of the iphone may have a little various alternatives in the menus, but they're similar enough that it shouldn't be confusing.
Kpatụ bọtịnụ Ihichapụ ozi na nchịkọta nhọrọ (mmalite nke iOS nwere ike ịnwe nhọrọ dị iche iche na menus, ma ha yiri nke ahụ ka ọ ghara ịdị mgbagwoju anya.