Hi EvansNiall,

Going to the end of a document is as simple as Ctrl-End. Alternatively, Shift-F5 returns you to the last editing point.

From what you've posted so far, though, it's not apparent why you can't just add content to the start of the document. If you're using a table, as seems to be the case from your 'first line/box' reference, simply insert a new row there, via Table Tools>Layout>Insert Above (or Insert Below).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]