Bad news, Zachdaman, I'm pretty sure this IS the wrong forum for your question. You'd probably be best posting a "Help ME!" question in something like NP's "Web Design Discussion" section -- then again, the Yoast support forum on WP.org might even be THE BEST PLACE to post your question,
WordPress › Support » Tags — breadcrumbs
In the mean time, let me take a stab at helping you with your problem...
But first, a WARNING!!! I'm no WP expert so take my suggestions with a grain of salt. I take NO RESPONSIBILITY for any damage/effect my suggestions might have on your site. You've been warned...
Now, back to our regularly schedule program...
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Since the error is telling you that the "breadcrumb" directory already exists, it sounds like your "breadcrumb" plugin is already installed. Have you gone in to your WP Admin panel and checked to see if it is already listed? If so, activate it and see if it works. If it exists and doesn't work, uninstall it through your WP Admin panel and then try reinstalling it.
If you find the Yoast isn't installed (isn't listed) in your list of plugins, then you might consider FTP'ing in to to your server (or use "File Manager" if you have cPanel) and rename the existing "breadcrumb" directory to something different (maybe "breadcrumbs1", this way you don't lose the original directory in case you still need it). Then try installing the Yoast plugin again to see if it installs -- and be sure to activate it.
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To REPEAT AND EMPHASIZE my previous WARNING -- I'm no WP expert so take my above suggestions with a grain of salt. I take NO RESPONSIBILITY for any damage/effect my suggestions might do to your site. You've been warned a second time...
Good luck!