Problem Modifying Sql data source command.

I have changed a name of my database's Table's field, it was "name" and i changed it to "username", so i must change my sql data source command according to this,
the problem is that in the source page i cant find the sql data source command

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CommentPicConnectionString1 %>" > </asp:SqlDataSource> its missing the select command property, and i cant reconfigure the datasource because there is a gridview using this (sql datasource + custom template fields) if i reconfigured the sqldatasource, the gridview will reset all datafields inculding the custom template fields.