How to reformat a USB flash drive?

I have 1.33 GB available on my Buffalo USB 2.0 GB Flash Drive that is formatted as MS-DOS File System (FAT 16).
Suddenly, every time I try to copy a MS Word document from my iMac to the flash drive I get the following message.
+"The item cannot be copied because there is not enough free space."+
I reported this to the Buffalo customer service and they responded with,
+"When you look at the files in the USB flash drive, do you see a lot of temporary files? Please delete these. If there is no other solution, I would like you to copy your good files onto your computer hard drive, reformat the USB drive, and copy the good files back onto the USB drive. "+
I did not see any temporary files, so I'm thinking that I have to reformat the flash drive.
But how do I do this?
I've backed up the files on the flash drive to my iMac.
I insert the flash drive and click on Disk Utility.
I select the flash drive icon and...
What do I do now?
The choices at the top are First Aid, Erase, RAID, Restore.
BTW, I am running on a iMac 2GHZ Intel Core 2 Duo, 2 GB 667 MHz DDR2 SDRAM, OS 10.4.10.
As is evident, I have no idea about computers.
Please advise on a step-by-step basis.
I thank you in advance for your assistance.

Select Erase. Volume Format: MS DOS System.

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