How to flip a layer without flipping whole image?

[helpingtogrow]

How do I flip a layer (horizontally or vertically) without flipping the whole image?

[Norman Sanders · Accepted solution]

Choose the Layer

Edit> Transform> Flip Horizontal

[giulianad50615520]

Go to Edit menu, which is next to the Image menu on the left and click trasform. That will modify the layer only and not the whole image/set of layers

[Raycheal5E7D]

This is the correct answer. 

[BarbaraBCG]

When I do the above when I want to flip a base layer in my ad, I get this response: "Could not flip because the selected area is empty." But,

I DO have the layer slected in the layers box! What do I need to do to get this to work?