Article in English: You can talk to them inside your mind or out loud. The subject doesn't matter at all. You can talk to them about weather, your day at work/school, your friends, a TV show you like... As long as you direct your talking to the tulpa, you'll do fine. The process is gradual and first contact from your tulpa can be difficult to discern; they won't necessarily jump into speaking full sentences right away.   This is completely optional, but you could use a method like 'parroting' or 'puppeting' though some people can find this controversial. But, many others believe that this can help a developing tulpa and encourage them to try to communicate. Sometimes if you are not sure if the answer you got was you parroting or your tulpa, always assume it was your tulpa. This step can take a while. Be patient. You can create a completely new voice in your head, but it may be easier to pick a voice you know well enough to imagine it saying anything.

Summary in Indonesian:
Bicara dengan tulpa. Pilihlah suara untuk tulpa Anda setelah dia bisa berbicara, kalau dia belum membuatnya sendiri.