netbeans中项目属性中的VM选项

I got a problem with the java heap space while using servlets in netbeans5.0 and got a solution to resolve it too,they asked to change the VM options of run category in the project properties.But,i couldnt find such option in my properties.Please do tell me what to do with this error. This is the picture of my project properties.I got a problem with the java heap space while