Problem: How do I change the web browser Eudora uses when I click on a URL?

Solution:

When in Eudora, hold down the option key on the keyboard and double-click on the URL. This will open a dialogue box asking you to locate a web browser to accept http commands. Locate the web browser application on your hard drive, highlight it, and click "Open" on the right. Eudora will then use whichever program that was selected as its default web browser.