Work down each section in turn: A. Cash Flow From Operating Activities, then B. Cash Flow to Investing Activities, then C. Cash flow from Financing Activities.
For every line that needs a mapping, use Search category... in the Category column and choose the ledger category. Fill NOTE and Amount only where those fields are enabled.
The Edit Cash Flow Statement page with NOTE, Search category and Amount fields beside each operating activity line
Click Submit, then return to Cash Flow Statement and read the lines for your period. The statement shows Amount and Previous Year Amount side by side, and stays empty until the mappings are finished and entries exist for the period.
Common pitfalls & FAQ
The Cash Flow Setting button is missing. The branch control is on a single branch. Switch it to All Branches and reopen the report. Owner's-Equity behaves the same way.
The category I want is not in the search. Check it exists under Settings > Accounting > Manage categories, and note its parent category. Check the effect before renaming one, because live reports read from the same list.
Some rows will not let me type. Summary and calculated rows can have their category, note and amount fields disabled.
I am not sure about a mapping. Click Cancel and ask. Half-finished trial mappings in a live period distort the totals your board sees.