It is simple. Just tap (touch) the line item you want to edit and it will open up the record.
BTW, if you want to delete the item, just long press (tap and hold) the item. This will bring you a small popup menu with 2 options viz Edit and Delete. Touch the action you want to do.
I hope this helps.
* Please tick solution from the bottom menu if this answers your question.
Regards
MSP