This quote is wrong, those are Davidvictorson response and not yours, see the correction below
However, explaining how to quote this post in detail would be helpful.
To answer this question, use the search function to search for this. It has already been answered in the past.
The search function (
https://bitcointalk.org/index.php?action=search) works like Google search.
This is how it should look so you don't end up plagiarizing someone else's post by trying to own it instead of referencing the original owner of the post.
Using BBcodes is just like basic programming, every opening tag must have a corresponding closing tag, when your quotes are not properly formatted, then it simply means that there is an open tag that was not properly closed, then you look out for it, close it and your quote would be good