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ChronologyCal needs calendar permission. Tap Open Settings in the app, allow calendar access, then come back and tap Try again. On iPhone the app may close when you change this in Settings; just open it again.

ChronologyCal shows the calendars your phone already has. Add the account in your phone's settings (the Calendars sheet also has an Add account button, which shows where to do it) and it will appear when you return to the app. Also check the Calendars sheet to make sure the calendar isn't hidden.

Widgets follow the calendars you show or hide in the app, and your phone decides how often they refresh. Open the app once and they should catch up. Without calendar permission, widgets ask you to open ChronologyCal.

Turn reminders on from Settings › Notifications in the app and allow notifications for ChronologyCal in your phone's Settings. Hidden calendars never send reminders. The app plans reminders for the next 14 days and refreshes them whenever you open it.

Open the Calendars sheet, choose Import .ics file, pick the file, check the preview, and choose a calendar you can edit. Recurring events in the file are skipped. Importing the same file twice creates duplicates.

Recurring events, and events with attendees, are view-only in ChronologyCal for now. Edit them in your calendar's own app. Everything else can be added, edited and deleted in ChronologyCal, except events on read-only calendars.