Hi I've the 5045 so I hope the settings are the same.
Q1. Normal recording of tv progs are done using TV, you use scart if you are recording from a sat or freeview box, basically you are pointing the liteon at were the signal is coming from.
Q2. On the bottom RH corner of my remote is a button marked timer, if you press that it will display all the progs that you have set (32max) to delete one, using the arrow keys highlight it(turns yellow) and move across to the far left little box and press enter.
If using timer record function and you have used the 32 quota it will ask you to delete one anyway. Hope this helps