Replace the arrow images with own images?

Hi,

I have been looking on the forum for help with changing the arrows but I can’t find what I’m after.

With these instructions: url(your_down_arrow_image_here.png) would it look like this?:

url(https://www.lifetelos.com/public_html/wp-content/themes/soledad/arrow1.png)

Because that is not working for me. I have put the code in the themes CSS identical to the instructions. Is there something I need to add to the shortcode? Are the brackets supposed to be there?

Also can the px height and width be any size I like or must it be the same as the psd that was included in the plugin?

Thanks for the assistance in advance.