Need to fill out a form on Adobe Acrobat

Why wont it let me?

[sadelb]

I am trying to fill out a form on adobe acrobat so I can type the information directly on it. Is there a program that will let me type my information on this form rather then printing the form out and writing on it? Somebody told me that they have some sort of secure program on it now to avoid people typing on forms through adobe. Is this correct? How can I type on this form? Thanks

[netscan]

The form must be designed with an editable region in order for you to type directly onto it. If you have the full version of Adobe Acrobat you can edit the form itself to include such editable regions.

I believe there is an open source free solution for this, but I cannot remeber what it is right now, anyone care to chime in?