I have noticed people doing different things when quoting from someone else's post. It can be useful when quoting that the original member's name comes with the quote. A number of times, I have seen the word 'quote' and have had to scroll back to see who made the original comment.
If you wish to quote the entire content of the post in your reply, the simplest way to do this is to just click 'quote' in the bottom right hand corner of that post . All of the original post should now appear in your newly opened reply with the original poster's name.
Quite often, you may only wish to quote only part of the post. In this instance, click 'reply' as usual and then scroll down through all the previous posts until you find the one you wish to quote from, highlight the targetted words and click 'quote' in the top right hand corner of that post. The intended section of the original post should now appear in your newly opened reply with the original poster's name.
This all sounded very clear in my head...... It's very simple really!

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Is foghlaimeoir mé. I am a learner. DEFINITELY wait for others to confirm and/or improve.
Beatha teanga í a labhairt.