To add a field to the blog list you have an option to add few types of fields for which the blog module have ready made definitions.
Go to Administration->Settings->Advanced->ContentView->Controls->BlogsBackend->Views->BlogBackendList->ViewModes->Grid->Columns and there will be listed two columns Title and Actions which are the columns that are there by default. When select Columns node there is Create button that allows to select what type of column will be created.
All the best,
the Telerik team
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