Changing Site URL

I know this should be a relatively easy task, but I’m a little stuck!

My wordpress URL is http://www.dfrc.ca/wordpress/

I’d like to change the site address to http://www.dfrc.ca so that all my old website content is hidden and my wordpress stuff shows up instead.

In my Fetch FTP, I already copied and moved the index.php from the wordpress folder to the main root directory, along with changing the bit of code in the php doc to have “/wordpress/wp-blog-header.php”

What I’m confused about is that in my FTP, I see that my website already has an .htaccess file in the main directory, with a bunch of code already on it that has nothing to do with wordpress. My wordpress folder itself doesn’t have an .htaccess file (I don’t think I used “pretty permalinks” on there???) so I’m not sure what to do here.

My 2 questions:

• Should I modify the existing .htaccess file so that it includes the code that the wordpress codex said I should have in an .htaccess file?

• What steps am I missing in ultimately achieving the goal of moving my site URL?

Help would be greatly appreciated!

Please and thanks,
Melody