About sd card files

[Soυɾყα]

I am unable to edit or delete sd card files in Adobe Acrobat reader application,it is showing

"This task could not be completed. The device storage area (eg. sdcard) may not be writable", when i want to edit or rename or delete sd card files in adobe.

How can i able to edit this files in adobe, please suggest...  

[Bernd Alheit]

What happens when you use a file manager for this?

[Soυɾყα]

By using a file manager, it is much easy and comfortable to edit a sd card file, but in Adobe i can't.