Using the goals feature, you can dedicate time to work on the new tasks you've created, specifically by setting a goal to write a certain number of words each day.
You can make a new goal from the goals page, or you can do it right from your homepage. Once you set up new goals, you will see whether you're reaching your targets or not right when you sign in, so you can keep yourself honest about how much time you're dedicating to a given project. You might also find motivation to keep beating your record when it comes to accomplishing and exceeding your goal targets, and that can only help your productivity.
If you've set your sights too high with a goal or completed the affiliated task, it's easy to edit and delete goals from the goals page. Just click on the goal and choose the option to edit or delete it.