How do I unlock a layer in photoshop?

I am brand new to photoshop! I was cropping photo's and changing hue's. I somehow did something so that when I try cropping it says the layer is locked. I know NOTHING about layers and didn't really know I was using one. When I open a new file into Photoshop it won't let me crop my photo because it says the layer has been locked. What do I do so that I can unlock and crop my photos?How do I unlock a layer in photoshop?
If it's the background layer, just double click on the Layer in the Layers palette (make sure you ALWAYS have the Layers palette open, if it isn't go to Window%26gt;Layers.) When you double click it will bring up a little window that will allow you to name the Layer, and it will already say Layer 0. You can accept this or rename it (use Layers to organize what you do in the image; name them in some way that is useful to you.)





Note, you always want to use Layers. They are your friend! Think of them as sheets of transparent or translucent paper stacked on top of each other. The top layer is the top sheet in the stack. In the Layers palette, you can do things to different layers (add effects, for example), you can rearrange the layers by dragging them in the palette, you can add masks to a layer, you can turn layers on and off by clicking the little eye icon (to help you see what's underneath.) You can lock individual layers by clicking the Layer thumbnail to make sure it is selected and clicking the lock icon on the top of the Layers palette. Click that icon again to unlock it. (Locking is useful when you have many layers and there are some you don't want to mess with while you are doing stuff to other layers). You can also delete layers (say you end up with an extra layer you don't need, or it's a layer you did something to that you don't like) by just dragging that layer in the palette to the trash can icon at the bottom of the palette.





As a very good general rule, when you open an image, do three things: (1) do a Save As and rename the file to something that lets you know it's the working copy (2) when you Save As, in the dialog box drop down menu select Photoshop (.psd file type) so that you are working the native Photoshop file type which will allow you access to everything in Photoshop (some of the things Photoshop can do won't work with some file types) and (3) once you've got your Saved As copy, in the Layers palette, click on the Layer icon (usually will say Background layer), and drag it to the icon at the bottom of the palette that looks sort of like a square page with a folder over corner. That's the New Layer icon, and by dragging the layer to that, you are creating a new layer that's a copy of the original layer. So you can do stuff to that new layer that doesn't affect the original, which is underneath.





Why should you do these things? (1) you will always have your original image (2) once you mess with the image the way you are working, you are making permanent changes to the pixels; once you save the image you can't go back. It's always a really good idea to work on a copy so that if you mess up or aren't happy with what you've done, you can always go back to the original.





Note that it's also a very good idea to save every-so-often. It's easy: on a PC, hit Ctrl+S, on a Mac hit Command (Apple key) + S.





Hope all this info is useful.How do I unlock a layer in photoshop?
----------------------------------------鈥?br>




if it is photoshop 6 then you have to right click on the layer and there is option unlock, then unlock it.





if it is photoshop 7 then double click on that layer is perfect.