Read the pm you got when you signed up, you have to make at least one post your name turns blue then you can, go to computer, right click on USB drive ( data traveler) format, a pop up comes up at the top look for fat if not already fat32 click drop down and change, bobs your uncle
Added after 2 minutes:
I can see why the moderators get peed of people not reading the first pm, I only joined this week but lost count of people who ask same download question and it's all explained in that message.