Do you want get link to another post inside your blog you must installed plugin first , yup you may know related post plugin or random post plugin, its very popular plugin but some problem in front your face , any hosting ask you for removed this plugin becaouse they required some high resource when visitor reach 500 UV/day, oh thats bad , but dont worry i herd from blog.rosihanari.net there are any other plugin with same function with low resource required that is "Other Post From Cat" you can download here http://www.dagondesign.com/articles/other-posts-from-cat-plugin-for-wordpress/

you may see the notice bellow

"This plugin will show the last X posts from the current category at the bottom of every post, or where you manually specify in each post. Using the built-in options page, you can choose the number of posts to show, set the header text, choose to show the post dates, select the format of the date, and choose whether or not to include the current post in the list. The latest version also has an option to show recent posts from all categories the current post is in"

source:agitsan

Mixx it!