GDATA API

[Rani]

I have to integrate google spreadsheet into my project.In that project user has option to upload his data to google spreadsheet. I m able to fetch all spreadsheets and all worksheets with data of particular spreadsheet. But I m unable to

-insert new record,update/delete record in spreadsheet's worksheet
-unable to create spreadsheet or add new worksheet programatically

I have read all documentation but not found the solution of my problem yet.
I m new in iphone development.

Which class and methods should I use for it from GData api.

If any one has any idea or solution plz help

thanks in advance