If you would like to know how to download and install games, or are having some trouble, check here!
Hit the download link, then go to the upper right corner and hit download.
Find the zipped folder.
Unzip it.
A folder should appear with the name of the game. Put it in your Finder, or on the desktop, or wherever.
Open Java and find a world, any one works. Select it, hit "Edit", then "Open World Folder".
You should see the world folder(s) inside the "saves" folder.
Move the inner folder from earlier into "saves".
Go back to Java and click the "Save" button to return to the world list. Your download should be there.
Hit the "Download Resource Pack" link, than download the folder
Unzip the folder, and place it somewhere you can find it.
Open Minecraft.
Go to "Options," then to "Resource Packs," then to "Open Pack Folder." This should take you to a folder inside .minecraft called "resourcepacks."
Drop the resource pack in, then go back to Minecraft and activate the pack.
A note about resource packs: A weird anomaly with the zipping/unzipping of files can create a folder called "_MACOSX" inside the newly unzipped folder. If this happens, there should be another folder with the original file name. Remove the intended folder and put that in "resourcepacks."
If you have a bug to report, you can fill out the bug report question on the survey here.