After you download the installation file to your desktop, a folder named "Yahoo! Messenger" should appear. Inside this folder, is the Messenger program. Click and drag it into your computer's Applications folder to copy it.

If you've downloaded Yahoo! Messenger and can't find the file (or don't know what to do next), try this:

1. Click the File menu.
2. Click Find…
3. Search in "Local disks," and type "Yahoo! Messenger Install" in the area next to "Name" and "contains."
4. Click Search.
5. One file should be returned in the Search Results window.
6. Click this file and drag it onto the desktop to create a copy of it there.
7. Close the "Find" and "Search Results" windows and all background applications, including your browser. (Make sure to fully close them, not just minimize them.)

Follow the installation instructions above to copy the program onto your computer.