An alternative method, once you have the desired text highlighted (or selected), is to use the Edit menu near the top of your browser or office program.
Edit ==> Copy (If you want to only copy the text to another location and still keep the text where it is)
Edit ==> Cut (If you want to remove the text in question).
Move the cursor to where you want to put the text, then Edit ==> Paste
If you are pasting the text into a different document, use the Edit menu of the document you are moving the text from to use the Cut or Copy command, and use the Edit menu on the document you are pasting to to use the Paste command.
Another alternative method is to use key strokes. Sometimes this is necessary.
Ctrl + c is the copy command (That means to press down the Ctrl key and while it is down press the letter c. Same for the following substituting the alternate letters for c.)
Ctrl + x is the cut command
Ctrl + v is the paste command