Memou

Thank you all for your valuable suggestions, much appreciated!

Hi all of you knowledgeable people, first timer here. I have a IS250 2008. I love it to bits but would like to update the sat nav maps. I have checked the manual & it tells me how to eject the old dvd. I haven't done it yet as I'm not sure about taking the front panel off, in any case, when I press the MAP DVD button it says there is no DVD! I have read up on Lexus website & they say either remove the card (I can't find one) or plug in USB stick (I can't see a USB port). Can anyone tell me where to look please as it's not obvious to me. Or doesn't it get updates? Sorry if its a stupid question but it's bothering me.