I have installed Jobberbase correctly and have made a few changes, like adding my logo, cities and categories, but must have done something wrong as I get an error now when I try to do a test post. Strangely enough I made no changes inbetween making a succesful test post and getting an undefined variable message when doing the same thing again. Admittedly, I basically have no idea what I'm doing, and need help urgently. I also need a few modifications to be made, like changing some text colours, etc.

Please help ASAP!