Drag the contents of the Tab & Scoreboard Configuration vX.X.X/plugins folder into the /plugins folder of your server. This should hold the config files for Tab, Skript, Itemsadder and PlaceHolderAPI. You can then restart your server and move on to the next step.
4. Final Setup
Tab & Scoreboard Configuration should now be working on your server. However, all players will need the "tab.bossbar.toggle" and "tab.scoreboard.toggle" permission to be able to use the /scoreboard and /bossbar. Make sure you grant this to the rank that you want to be able to use them.