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).

 Figure 4