type /f tag (faction name) then ur good 100% unless another faction has that name, it does not have the faction plugin or both btw my name is nerdprince0 look up ropecraft its a nice server.
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To answer a faction invite just do /f join <faction name>
You use /f leave [faction name]
If you are in a faction, and want to teleport to your faction home, just type /f home.
I assume you're talking about a faction invite. the command is /f join <faction>
someone who moderates the factions