Calendar and scheduling / completing calls

Calendar and scheduling / completing calls

Hi,
I want to be able to go into my day.  See my activities.  Then, as I complete them, I want to schedule a new task.
When I do this, I keep having to change screens.  Plus, after I've completed a task, it still shows up on my list of activities to do, even though I already completed it?  So, I keep going back to to the same tasks.  How to I get them out of my daily task and how do I schedule a follow up task without having to go to a new screen?

Also, when I go back into the account later, I see that the completed task does not register in that account.

Thanks,
Rachel