nahh, only if you want to! lol It basically give you a vote slider on STEEMIT if you have under 500 SP, and also notifies you if an active comment exists on an expired post that you can upvote instead.
For most people, so far it's been pretty much plug-and-play. And they're especially thrilled to suddenly find a vote slider directly on STEEMIT.com when they upvote posts! :)