Hmmm, I can’t understand what your problem is exactly.
Yeah, I get that a lot. 
(badumtss!)
But this reply is a good example - on my phone I long-pressed your original text to get a word selected, adjusted the selection, then tapped Quote from the pop-up menu provided by the site. Et voila’ this Reply box opens with the selected text pre-filled and here I am typing below it.
But probably 75% of the time that initial selection doesn’t happen and it is literally impossible to quote!
As a workaround you could hit reply and use the button on the left to quote the whole post. Delete parts of the quote which are not needed.
2 Likes