If the students have used instant messaging, then they will already understand the concept. Students are happy to use this service because it's online, immediate, and anonymous.
To access YourTutor follow the links from the Library website: http://www.Leeton.nsw.gov.au/library.html (or Google "leeton" and follow the links from the Council website which comes up as the first result). Students will need to enter their Library card number so if they don't have a library card they can bring a parent or guardian into the library to easily obtain one.
The staff at the library would love for as many students as possible to access this site as they would hate to lose the service through lack of use.
Please don't hesitate to contact the friendly library staff if you need more information or you can visit the YourTutor website http://yourtutor.com.au/