Hi siukin,
Sorry for being this late.
When one employer selects the application type “Application Instruction” , he will see a textarea right below to insert url/message. Under your case, it might be due the two issues as below:
1) Employer does not insert required information => employer needs to insert url/message into the textarea
2) The textarea does not occur for employer to insert information=> this is bug due to coding and we need access to admin area and FTP server for inspection and solution. (If so, please log in http://support.joomlart.com/ and provide us these login details via ticket ID#(RNQ-269773) )