Hi Nurhan,
Ok so first the bad news... there's a bug in NWDS to do with how it interacts with Adobe Livecycle Designer - i.e. the SAVE button doesn't work. PLEASE PLEASE PLEASE report this as a SAP Message because we need this fixed and support always take more notice of customer complaints than complaints from employees (go figure 
).
Now the good news.... there's an easy workaround.
Open up the Adobe LiveCycle Designer application directly on your machine (e.g. by running the FormDesigner.exe application from the Program Files > Adobe > Designer folder where the install placed it).
Create your form in there... it's actually better to do this anyway because then you have the full real estate of your screen to work with.
Save your form (Save as ... .XDP format) to any appropriate folder on your machine, e.g. Adobe4NWDS.
Now go back to the NWDS Resource Project, open up the src > content folder and use Import.... from File System to upload your .XDP file.
You can then build and deploy your Resource project as usual.
I haven't covered the set up of the .XSD file or the creation of the Data Connection or the ECM folder to store your XSD file and XDP files as they are all covered in the SAP Library help... just follow the bouncing ball with that stuff and it all works fine.
Oh and don't forget the Submit button needs to be the VERY first button in the Adobe Hierarchy view as per the SAP Note mentioned in my blog http://scn.sap.com/community/bpm/blog/2012/06/22/10-tempting-tips-for-building-sap-netweaver-bpm-processes
I have to say the Adobe offline form is a brilliant bit of functionality - so all the best!
Regards,
Jocelyn
