In your account on the left side menu, you click on the To dos menu item.
Most often, you will be assigning tasks to other people within your organization. You can do so using multiple types of assignation.
You can see the task assigned to others in multiple ways.
In your To dos page, click on the Tasks assigned by me to others tab. From there, you will see all the tasks assigned to others and their statuses. You can also edit the task previously assigned to others.
By going to the file of the startup or the user you assigned a task to you, you will be able to see if the task is still pending. If the task is still pending, (not yet completed), it will show in their task block.
To see how to create a task for yourself, click here.