It’s super easy!
Doesn’t matter where are you in the Tasks section, there is always the New task button in the top right corner.

The New task will open a modal window with all the necessary task details.

Here you can input the basic things:
- Name
- Due date
- Priority
- Starred flag
- Done flag
And also some more advanced stuff.
- Project
- Client
- Tags
- Detailed info (4k characters)
- Recurrence rules
- Daily
- Weekly
- Monthly
- Yearly
- Custom