which parameter take Yet another post Plugin in WordPress

hii i am using yet another post plugin on my 404 custom page but want to know which parameter or variable this take to show related post i want that which paramater pass in my 404 page url i can use that for showing related post to those words
For example
my 404 page url is

domain.com/missingwork

now i want to show related post relating to missingowrk WorD
where i give it or how i can use it ?
How to make it possible plzzz tell