Is there a way to log into my account and build a workout from a desktop computer and save it? I would like to build workouts and do them later in the day. Thanks!
Not as of yet, but there are updates to the website that are coming that may allow this.
You can use an online Zwift workout creator from any computer to create a workout:
Download the workout and put it in the workouts folder on the device that you run Zwift on. I create my workouts on my desktop computer then install them on my laptop. Alternatively just install Zwift on your desktop. Even without bluetooth or an Ant+ stick you can still run Zwift and create workouts.