Store details.
Choose Account in the app's menu. Store details lists the Store domain, Store owner, Notification email, Time zone, Currency, Shopify plan and when Actorly was installed. Every value comes from Shopify and is read when Actorly is installed. Where Shopify has not told Actorly, it says "Shopify has not told Actorly this".
Choose a language.
This changes the language of Actorly only. The language your customers see is set in Shopify, and Actorly does not touch it.
Questions.
Can I edit my store name or email in Actorly?
No. None of it is Actorly to change. Change it in Shopify.
Where do I change plan?
In your Shopify admin. Shopify handles all billing for Actorly. See plans and history.