How to train Bougainvillea?

[zhuzhu]

https://www.pricescope.com/community/threads/bougainvillea.48704/

I just saw the lovely thread above but unfortunately can not reply to it. Would you garden-sassy ladies please advise me on how to train my 4-feet tall potted Boug into fat and colorful bush for privacy screen? It is currently tieded to/growing on a wooden stick.

I simply love them!