If you’re already logged in, then you can go to your homepage and scroll to the bottom until you see the “Edit” link. It should be right before the footer. That will take you to the Page Editor where you can make your customizations. The same goes for any other page.
You can also access the Homepage by going to your Pages link in your admin. It will show whichever page is set as the homepage.
I plan to have the documentation updated this week for the Aspire theme. It’s currently showing the old documentation for the previous version, but I will have that updated soon.