wp-admin NOT showing

After installing WP Robots Txt, I noticed that once I pressed “Update” after any changes on the 2 websites I installed it in, I would get a blank page and I’d have to return to those pages manually through the URL. Now it got worse, I can’t access the backend of any of the sites I installed it in. If I type example.com/wp-admin, I get a blank page. I believe I left the User-agent:* Disallow:/wp-admin/ and Disallow /wp-includes/ on the file. Could that have caused it? Regardless… How do I go back to what I had before? I already ftp’d into the server and deleted the plugin files manually but I still get a blank page. How can I fix this? Thanks! http://wordpress.org/plugins/wp-robots-txt/ > I believe I left the User-agent:* Disallow:/wp-admin/ and Disallow /wp-includes/ on the file. No, that doesn’t do anything that would block you from the admin area. Other plugins you have installed? What theme are you using? It’s likely just a strange interaction or some such. You can “emergency disable” a plugin by FTP’ing into your site and renaming the plugin folder. I am facing another problem regarding this plugin.. I can’t see the contains of robots.txt file into front end..it is showing 404 page not found. here is it : http://www.pvcwindows.com.au/robots.txt I want to see the contains in it … Please help me…..its very urgent.. Thanks!! http://wordpress.org/plugins/wp-robots-txt/—— ; it is the plugin link