I'm new to the 4x4x4 and I can't find much info on this scenario...
I have the first 3 layers solved. The top layer (yellow) only has the middle 4 solved. ALL of the edges and corners are not yellow. Where the heck do I go from here? I put each edge on the correct side it should be on, but they're all flipped. I know the alg to flip a single edge but I'd prefer not to do that 4 times

Any help would be greatly appreciated!
edit: the alg I memorized for flipping 1 edge pair is this - r2 B2 U2 l U2 r' U2 r U2 F2 r F2 l' B2 r2.