How do i reset the answering machine on my cordless phones at home

My panasonic handsets have a row of black buttons above the number keys and answer and end call buttons. The screen above these shows little pictographs of what the buttons will do, the left has a book which is the phone numbers stored on the hand set, the middle one has a picture of 2 rows of 3 white dots, this is the button to press once. You then get options of Caller list, Answer system, Handset setup and Base unit set up. Use the big central button with arrows to scroll through the list, please note that the base unit is off screen initially. Select Answer system by pressing the black button below ok. This givs a new list of options, Play new message, play all messages, Record Greating, Answer on, Answer off, PLay greating, Erase message and settings. Slect the required option by pressing black button below the on screen OK. The left hand button will take you back a step, but if you don't press anything after a short time hand set returns to normal. Hope this helps