Unless I wish to quote the entire content, I do it like this.
Select the desired text and copy it to the past buffer <Control-C>
Start a reply
Manually enter the text "[ q u o t e ]" (with no spaces) then paste the selected text and then manually enter the text "[ / q u o t e ]" (again with no spaces).

Your reply will look like this:
Quote
(with no spaces) then paste the selected text and then manually enter the text

viz:
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To quote an entire post content (which is separate to your inquiry), just press the Quote button:

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