There is a 'Quick Reply' box near the bottom of the page
There is a 'Post Reply' button at the end of the thread
, lower left.
There is a 'Quote' button inside each individual post
, lower right.
Each post in the thread is surrounded by a grey/blue box.
When logged in on computer or phone
In the lower right of that box will be 4 buttons.
One button has a graphic of a ship's wheel
and the word 'Quote'
The next button has a graphic of a page and a large quote mark.
The next button has a graphic of a page and a quill.
The next button has a graphic of a thumbs up and the work 'Thanks'
To quote from a particular post,
Click the 'Quote' button.
The entire post will then appear in quotes in the top of the usual 'Reply to Post' page.
To quote from multiple posts,
In each post you want to quote, click the small box with the large quote mark.
After all those posts are selected, click on 'Post 'Reply' at the bottom of the thread (NOT the 'Quick Reply' near the bottom of the page).
All those posts will then appear in quotes in the usual 'Reply to Post' page.
When not logged in on computer or phone,
In the lower right of the post will be 1 button, the quote button.
Click, and it will take you to login. Then to the 'reply to post' page.
Or use copy and paste to quote, sometimes that's easier.