How do I create a Macro to automate an action - in Excel for Mac 2011

I have 5 spreadsheets with 1,000 rows of data in each spreadsheet.
I need to format text in column A (AuthorId) that will identify it as a Twitter handle.
I need to have the following text added ( in front of existing text in cell A2 (milfordnissan).
The final result should look like this:
This step needs to be repeated for ALL cells in column A.

**OR the other option is to remove text in column C (AuthorUrl)

If we could remove the "http://" from the beginning of the text in column C then I could still get my desired result which is: This step would need to be repeated for all cells in column C (AuthorUrl).

I am attaching the file. I have 4 other files that also need this macro to be applied.

I would appreciate step by step instructions or if someone could record the macro within my document, that would work too.
Myra BellAsked:
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Eoin OSullivanConsultantCommented:
If you simply put the following into column A put it in row 1 and copy it down the entire column A


This simply prepends the text to the value stored in B1

or if you want to use the value in column C then put the following in A1


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pls try
Sub Macro1()
'    Columns("C:C").Replace What:="http://", Replacement:="", LookAt:=xlPart, _
        SearchOrder:=xlByRows, MatchCase:=False, SearchFormat:=False, _
End Sub

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Myra BellAuthor Commented:
Thanks Experts! Both solutions worked. The macro was the automatic process while the formula is something I can easily remember and repeat. I'm saving both solutions for future use.
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