How to edit or insert cell data using gdata-objectivec-client?

[sajaz]

I am able to fetch All the feeds, Worksheets and Cell data of a Google Spreadsheet using the GData Objective-C Client.

But I am stuck with adding/modifying cell data on a Google Spreadsheet using the GData Objective-C Client. I used this GDataObjCIntroduction - gdata-objectivec-client - Introduction for Objective-C Developers - Google Data APIs Objective-C Client Library - Google Project Hosting

If there is any code example, highly appreciated.

thanks in advanced.