All Setting Page Blank

I don’t know what to do ???.I install iThemes Security plugin.When i click setting page for set up it show blank page.Please See this image for realize what do i mean.Sorry for my poor english.Thanks

Screenshot Image:

<img src=”http://banglablog24.com/wp-content/uploads/2014/05/2014-05-15_165232.gif”&gt;
My site is: bangla blog

https://wordpress.org/plugins/better-wp-security/