How can I edit my website?

Just add /qi at the end of your website url (full URL or museumssites.com subdomain) and you will access your administration interface (Qi). For example http://username.museumssites.com/qi this link gives you access to what is commonly known as the "backend" of your website.

From there you may configure all of the elements of your website and upload and edit your content, images and other media assets.

The documentation is accessible from your Qi Dashboard, but also linked here.