How Do I Reference the Changing Value Of Cell B2 When Adding a Row Above?

I have a spreadsheet with information in B2 that I reference in a different sheet, and add a row above the next week. I want to always reference the newest value, but the referenced cell in the summary sheet follows the original cell (now B3) and not the now new B2. Making B2 a $B$2 did not do it but gave an error message. Ideas? Thanks.
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Julia