Firstly head over to the tasks section
Click on the add a task button
Write out what the task is in the task field
Select a group - if you haven't created any groups or the right group yet, don't worry you can change this later, just leave it ungrouped
Add in what priority the task is from the drop down menu
Low
Medium
High
Click add task
OK your task is now created
To add notes (or to view notes) to a task just click on the add notes link
To delete a task just click the x next to the name of the ask you want to delete
To mark a task as completed just click in the box next to a tasks name
To mark as todo again if you click by mistake just uncheck the tick box
To change the group or the priority just select the right one from the drop down boxs