JPostSlider problems…..PLEASE HELP!

I am trying to add another J Post slider picture to my blog but i cant seem to do it.

My web designer linked the j post slider pictures to my post section of my website, it means entering a custom field section that links to the picture i want to add on the server, but when i do this the custom field section dissapears and i have no addtions to the main slider.

PLEASE HELP!

thanks

Liam