On the left hand side of Workast, click on the space that you would like to create a new task in.
Click on "Add a new task" or the red + and this will show you where you can start typing your new task. You can add a new task in any list in the space/channel.
Type the details of the task to create a new task and press enter to save.
The task has now been created in the space.
For more information on how to create tasks in Slack, see our guide here.