First off you'll need to get FFZ which you can do here. I would strongly encourage you to not use both FFZ and BTTV at the same time. While you can do this, they do not play nicely together and you will lose a good deal of functionality in FFZ by using BTTV at the same, including the ability to blacklist keywords.
Once you have FFZ installed head over to the settings by clicking the little upside down FrankerZ in your chat box.

Select the cog wheel and head over to "Advanced"

Expand "Chat Filtering" and select "Banned Words"

In the popup that opens you can then add words like "!enter" or whatever else you'd like to remove from chat.

After doing this any of the words you've entered will now show up as *** so we need one more step to remove them entirely from chat. Still in "Chat Filtering" scroll down to find "Remove Messages with Banned Words" and select "Remove Message"

Next up we'll want to get our BTTV emotes back (we need our animated gifs afterall right?) In order to do that you'll need the FFZ-AP which you can get here. After installing that head back in to the FFZ settings and you'll now see a new section called "FFZ Add-on Pack". Here you can enable or disable BTTV emotes, gif emotes, and a few other things like Gamewisp integration.

Hopefully this post will help out those of you having trouble navigating the extensive settings menu in FFZ. If you have any questions about FFZ or FFZ-AP feel free to respond to this post and I'll do my best to answer them.
Good show!
Brian \o/