delete entire rows

Hi, I've my spreadsheet looks like this below. I would like to delete every row that has blank cells. I've googled around and there are loads of scripts that supposedly do this, but none of them work. I should say, I am an absolute programming newbie, but I would like to learn and get better.
I have one request for the kind soul that would volunteer to post a solution: could you include line-by-line instructions about what every single command in your script does? To compare this to a car, I would really, really like to know where the battery is, what it does and how it relates to the carburator and the spark plus and so on, rather than just put the key in the ignition and drive off....
I'm very grateful for your help!
Yours,
Simon

10/3/01 0.69 0.6943 1.4402
10/4/01 0.7 0.6979 1.4329
10/5/01 0.7 0.6985 1.4317
10/8/01
10/9/01 0.7 0.6986 1.4314
10/10/01 0.7 0.6994 1.4298

The following will delete all rows where there is no data in the B column

Sub deleteRows()
Dim i As Long ' declares i as a long integer variable
Dim lRow As Long

lRow = Cells(Rows.Count, 1).End(xlUp).Row ' determines last row with data in 1st column
'Cells(rows.count) determines the highest row number
' .End(xlUp) finds the last row with data
' .Row grabs the row number

For i = lRow To 2 Step -1 'loops through rows from the bottom up
    If Cells(i, 2) = "" Then 'checks to see if the B column in the current row is blank
        Cells(i, 2).EntireRow.Delete 'if B cell is blank, delete the row
    End If '"closes" the if statement
Next i 'loops to next i (row)
End Sub