Several artists have written to say that their own website hosting service will not allow them to create new folders. If that is your situation, then you can skip that step.
However, if possible, try to follow the next step, which is to name your image "jolafpic.jpg" and keep it within the defined size limitations, which is a maximum of about 410 pixels high or wide.
You can then upload jolafpic.jpg (or whatever image name you must use) to your hosting directory, so its location would be something like:
Please be very sure to tell us the exact address of your uploaded preview picture!!