Need help

Good morning! I wanted to ask you. I have a website like this http://uyt.com.ua/
and I need to make it so that when you click the "Products and Services" button, a menu appears like here http://uyt.sumy.ua/Please tell me how to do this. Also, I need the products to be displayed just like herehttp://uyt.sumy.ua/ . Please help a newbie like me, at least tell me where I can find this information. Thank you in advance.