Used simple edits in Genesis and site is blank - Can't get into the dashboard.
 

I edited something in simple edits and now my site shows up blank and I don't know if I can access the dashboard.

I thought I just removed a Pinterest button, but must have accidentally removed a bit of necessary code?

FTP into your plugins folder and remove the plugin

I sound incredibly naive, but how do I FTP?

I was deleting a Pin It button someone had installed using CSS, so I don't think it was a plugin.

If there is an error in Simple Edits that is making the Dashboard inaccessible you need to remove Simple Edits through either an FTP client or your host's file manager. FTP info here for your file manager you should contact your host.