You need to be on the ULTIMATE plan or the PRO plan with the "Unlimited boards" feature selected. The LITE plan allows you to have 3 lists maximum.
Parking lot and boards allow you to store tasks that don't have a particular date, they could be ideas, things to do later, or projects. Boards can be used to run Kanban projects, or store tasks in lists.
To go to Parking lot and boards, just scroll down to the bottom page
By clicking "Add board", you can create another board.
A board is simply a list of tasks:
You can add list by clicking the "Add List" button located on the right side.
You can also "Delete" or "Edit List", just click on the title
To delete a board, just click the option as shown below:
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