Next Post Prev Post Random Post plugin

Hi, I am looking for this particular plugin. I have seen it on many websites, I am not good in php to insert a code. Its my third consecutive day for my search for this plugin.

Here is the image of this plugin
https://i.imgur.com/zx6AF.png

This makes your post go to next, previous and random. Helpful for picture blog.

Here are the examples of few picture blogs who are using it

funny-pictures-blog[dot]com
9to5lol[dot]com
allgags[dot]com

I will really appreciate if anyone can help me. Its been hectic 3 days for me now. And I am just stuck on this.

Please help Thanks