Easily let website visitor know your website is in maintenance mode, while you are working on it and collect email from your visitors.
Yes, this is a plugin and will work with your existing theme.
As long as you're logged in, you won't be able to see it. That's a feature! This way, while you're logged in you can work as usual. To preview what it looks like, either a) log out, or b) try viewing it in another browser
If you have disabled the plugin, it won't show anything anymore. Usually, though, the issue is that you're seeing a cached version of the page. Try force-refreshing your browser, and then try clearing your cache on the server and force refreshing again.
That's great. We are always open to your input, and we would like to add anything we think will be useful to a lot of people. Please send your comment/idea to email@example.com.
Oops. Please send a comment to firstname.lastname@example.org. and we will try to fix it.