Taubermatei

Hi, what i want to accomplish is relativley simple, but i couldnt figure it out by my self. i want to write every 5 to 15 minutes an automatic announcement into the Chat. I experimented a lot, maybe somebody can help here. I did try do Reuse the TickingBlockentity example, but failed. i would provide more Informations, but i really dont know how to start. (First time modding a Game)