I have QEMac version 1.7.4 how do I change to allow for me to use Quicken On The Web

@eileen c Quicken Essentials for Mac is a long-discontinued product. You'd need to upgrade to the current Quicken Mac product -- which will import and update your Quicken Essentials data file -- and once you are up and running with Quicken Mac, you will be able to turn on cloud syncing services which allow you to access much of your data via a mobile app or web browser.

Note that Quicken products are now sold on an ongoing subscription basis, and you'll need to maintain a current subscription to have access to the online services.