What's Wrong with this Picture?

Below is a quotation of Titus 1:5 from the new version of the NIV.  I have removed one word from that verse and substituted another word in its place.

The reason I left you in Crete was that you might put in order what was left unfinished and appoint elders in every church, as I directed you.

Without looking it up, can you tell which is the word in question?

Do you know what word it has replaced?

(If you reply on the blog, please do so in a way that will not give the answer away to people who find this after you.)