How to add columns to a SSRS layout

I have an SSRS report which has been running for months. Now I need to add two new columns to the underlying query of the report. How do I add those two new columns to the layout?
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Chris LuttrellConnect With a Mentor Senior Database ArchitectCommented:
If it is a table layout then you right click on the column header and add the column.  (see image below)
rwheeler23Author Commented:
So many areas to have to know where to click. Thanks for your help.
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