A couple of you have asked me how I reply to replies on tumblr. The way to do so is to install missing-e. I’ve used it for about two years, and I highly recommend it! It’s an unofficial extension for tumblr that allows you to do more things! You can read more about it on the website. It only works on Google Chrome, Firefox, and Safari though. If you decide that it’s not for you, you can always uninstall it. 

http://missing-e.com/