FYI, hold over one word for a second or so. Option comes up to Select, Select All or Paste - try Select. You get a blue "lollipop" at each end of the word which you can drag to select more text in either direction. Fuller menu then offers you options to cut, copy or whatever. Then just place your cursor wherever you want to insert your text, hold for a second, menu pops up, select Paste.
This has been a public service broadcast.