ok firstly these are the tools required:
and you will also need a usb 4GB in size

Step 1. Download Unetbootin and run it. you will be greeted with this


Step 2. either select the OS from the red location in the pic or if you alrdy have the .ISO then use the Blue Section in the pic (NOTE: only use the red section if you havent got the .ISO alrdy downloaded)


Step 3. Select your USB media From the Brown Section in the picture


Step 4. Once you have done all of that then you cn just click OK and you will be greeted with this box and thn you just have to wait for it to complete