Creating a task reminding app but can't as I am stuck

am creating a task reminder app. When a user submits a task, a task card should appear in the task list displaying:
•The task title
•The selected date and time
•A checkbox to mark the task as completed
When the checkbox is ticked, the task card should automatically be removed from the list.
The app should also include an alarm/notification feature similar to the design shown in the attached image, so users receive a reminder at the scheduled date and time.
Based on the attached UI:
•Tasks should be displayed as cards.
•Each card should show the task name and reminder date/time.
•A floating “+” button should allow users to add new tasks.
•Completed tasks should disappear when checked.
•Scheduled alarms/notifications should trigger even when the app is running in the background.

For the life of me I don’t understand how to get the taskcard appear. I look forward to responses from everyone

Thankyou.