Adding a row manually to manually created table

Dear all

I seem to struggle adding a new row to a table i've created via "Enter Data" under "New Query" section on the "Query Editor" form. Only time i was able to add new rows (along with columns and values) when while on the "Create Table" form - but once clicked OK i see no option to add additional row. I can add new columns but not rows, and since this was created manually and there is no outside source i find it frustrating! Can you advise if this is by design or is it just me not comprehending it fully?