There are a few different ways to use SDK on Mac. One way is to use the SDK Manager, which is a GUI tool that allows you to manage your SDKs and download new ones. Another way is to use the command line tools that are included with the SDK.
To use the SDK Manager, first open it from the Applications folder. Then, select the SDKs that you want to install and click the "Install" button. The SDK Manager will download and install the selected SDKs.
To use the command line tools, first open a terminal window. Then, navigate to the SDK directory and run the "./install.sh" script. This will install the SDK into your home directory.