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Why can't I click any of the tools under "Edit?" I want to merge selected shapefile layers together, but all of the tools under "edit" are greyed out.

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Welcome to GIS SE. What GIS application are you referring to (e.g. ArcMap, QGIS..etc)? – artwork21 Jun 18 '13 at 15:58
QGIS. I'm trying to use Edit> Merge Selected Features – Alex Jun 18 '13 at 16:00
I've realised that you also have to Select the polygon too. it worked for me :) – user30395 May 19 '14 at 16:59
up vote 1 down vote accepted

You must "Toggle Editing" before any of the edit tools are available.

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Mingfeng beat me to it by seconds! – Darren Cope Jun 18 '13 at 18:30
Got it-- seems so obvious now, thanks!! – Alex Jun 18 '13 at 18:54
@Alex Please upvote helpful answers and accept questions that solve your problem so the thread can be marked as solved. – underdark Jun 18 '13 at 19:31

Right click on the layer you want to edit in layers panel, and select "Toggle Editting" when the context menu shows. Then the "Edit" menu will be enabled.

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