Clickable links with a drop-down box
So, there are a few websites out there that offer links that you can click on that take you to a new page or that same link, if you hover over it, brings up a drop-down menu with an array of other links that you can click. How do I access that drop-down box? It seems that if I tap and hold down, it gives me the option to highlight (which, that's what it is supposed to do) and if I just tap it, it takes me to that link's page (granted, every now and then, it will show that drop down box that I need to access). Any help would be greatly appreciated! Thanks in advance :-)
--Allison