problem with badi?

Hi guys,

I have a requirement that I need to create a transaction similar to standard transaction code MF42N.The new transaction should do the same thing what mf42n does but I need to add a new field personal number (RM61B-PERNR) in the screen of the new transaction.For that i need to activate the BADI RM_HR_INTEGRATION .How can I do it?

Can anyone please give me a step by step procedure for doing the above problem.