unable to delete files from kingston 'ur drive' 4gb usb stick

Go to yast–>System–>partitioner
And in partitioner you must go to choose your USB stick and right click on it and choose details(the first choice) then you select format and that’s all.

I have a different Lexar USB, I tried the suggestion to reformat the drive as shown in your post but there is no option on the right click. I found that I can change to a new partition by selecting the USB through the harddisk icon on the left and selecting create a new partition but I still doesnt remove the files. I would be very grateful for any suggestion from here please.
Many thanks in advance for your help.