A previous post on this blog shows how you can find family names to take to the temple using FamilySearch.
This article shows how you can find family names to take to the temple using a sister program of FamilySearch called Puzilla.org.
Puzilla is free to all LDS members and requires you to log into your FamilySearch account in order to work so the first step would be to go to www.Puzilla.org and click on the "Sign-In" button in the top right corner. This will immediately take you to the FamilySearch sign-in screen with which you are already familiar. Log into FamilySearch. (If necessary, click the following link to learn how to create your FamilySearch login.)
Rather than re-creating a detailed blog, the best way to introduce Puzilla and explain how to use it to find family names to take to the temple would be simply to watch their video introduction. After watching the video and finding your own names to take to the temple, you can also watch this great video overview of the process of preparing names for temple ordinances, click here.
Click the following link to watch the introduction video on Puzilla.