In order to add a board status for a task, go to the View menu – Agile and select Kanban. After that, from “Kanban” tab select “Backlog Board” and use drag and drop method in order to add a task to one of the columns: “In Progress, Next up, Done“.
Another way to add a board status is to select “Backlog Sheet” and add the desired status for each task by selecting it from “Board Status” field.