First you need to login to your facebook account then go to twitter app on facebook and follow the steps there. I’ve also included some pictures below to follow.
Click the twitter app link above or simply click this http://d-url.com/730af4
Add twitter app on facebook by clicking allow, showed on the image below.
login to your twitter account
Then that’s it and if you want 2-way status update, so twitter can also update your
facebook status click allow twitter to update your facebook status as shown below
then click allow status updates and you’re done! enjoy!!!