Here is how you can create tasks in a project and assign a task to user(s).
1. Go to Manage tab and go to Manage Projects page (Figure 1).
Figure 1
2. Click Edit button to go into a specific project. Then click Tasks in the left navigation to see the task list in the project (Figure 2).
Figure 2
3. Click Create New Task button to go to Add / Edit Task page. Fill in the fields (Task Name, Task Description and optionally an URL link for the task). Then select the existing users to assign the task to and/or the invited users to assign the task to (Figure 3).
Figure 3
4. Click Submit button to save the task and assign the task to selected users if any (Figure 4).