Tap the Share icon. This will open your Sharing Menu on your device. (If the icon isn't there, scroll all the way to the right on the first row and press MORE. Make sure YouTube is selected.)  If you aren't logged into YouTube, you'll need to select your account or enter your email address and password when prompted before proceeding. If you plan on extensively editing your video before uploading it, you may first want to transfer it to your computer and edit it there. If so, consider uploading from desktop instead.  It's in the upper-right side of the screen. Doing so will upload your video to YouTube. Once the video is live, you'll be able to view it on your channel.

TL;DR in Indonesian:
Buka aplikasi Photos. Tekan ikon YouTube. Tambahkan judul dan deskripsi video, kualitas, privasi, dll. Sentuh ikon "Upload" atau "Publish". Tunggu hingga video selesai diunggah ke YouTube.