How do you install a minecraft skin on a mac?

Version 1.

First, download the map (Skyland).

Open up Documents, My Computer, or something similar.

type %appdata% in the long bar at the top.

Find and open .minecraft.

You should see a folder called Saves.

Add your world in there.

Version 2.

Open up Minecraft.

Go to Mods and Texture Packs.

Click on Open Texture Pack Folder.

Go up one folder.

You should see a folder called Saves.

Add your world in there.

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%appdata% is only on Windows,

For Maps, hold down the Option key the same time you click on the Go menu in the upper Finder bar (click on an empty part of the desktop) and click on Libray then click on Application Support/ minecraft/ saves

The long way is Users/ yourname/ Library/ Application Support/ minecraft/ saves

For texture packs put them in the resource packfolder.

Don't forget you can make an Alias of the minecraft/ folder and put it in the main Minecraft game folder with the rest of your misc items so you don't have to keep going back and forth.