How to add new rows on a Google Docs spreadsheet?

Usually, in desktop version of Google Docs spreadsheet, I will enter a number of new rows if current document has no rows remaining, so I can extend down the document. I installed Google Drive on my Gingerbread and has a spreadsheet file in it. When I open it, I want to do so with my Android app but how can I do it? Which button should I press?

Source: http://android.stackexchange.com/questions/39380/how-to-add-new-rows-on-a-google-docs-spreadsheet

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