Keep the leaves and flowers facing downward. Leave for several days to dry, checking every now and then. Be sure to tie on securely in case of windy days.    After bundling, tie a paper bag around the bundle. Hang the whole bag outside. The bag will provide more protection against the sunshine. It will also catch any seeds that dry too, if you want to collect them.

TL;DR in Indonesian:
Potong herba saat embun sudah kering. Ikat menjadi bundel dengan karet gelang. Gantung di suatu tempat pada teras atau pada gantungan di tempat yang terdedah matahari sepenuhnya. Keringkan di luar rumah atau di dalam kantung kertas.