To edit this section, go to Online Store > Themes and click Customize.
Once inside the Customizer, you should see “Ticker” listed with all the other homepage sections. If it’s not there, add it by clicking on “Add Section.” After adding it, click on “Ticker” to open the settings.

The more text you add to it, the faster it’ll scroll. If it starts scrolling too fast, click “Too fast? Check this to slow it down” to reduce the speed.