Add this jar file to you ADDONS folder located inside the MBedwars folder.
If you like, you can move your old config files from v1.0 into the addons folder as well (the whole folder, not just the config files), and they will be auto-updated (please do this I spent hours on the updating system)
If coming from Tweaks v1, be sure to remove tweaks 1.0 from your PLUGINS folder.
If you are coming from a v2.0.0 pre-release your configs will auto update.