passing values from form in Workflow

Dear Friends,

I am inserting a form in workflow and i want u use the values which i enter in form for further processing. I wish to know how can i return the values from the form.

eg. i have a form which has matnr & maktx on it. now if i enter the value of matnr as '38' i wish to send mail as 'material entered is 38' and if i enter material as '39' it should send mail as 'material entered in 39'.

Please help me as i need the solution very urgently.

Ajay