That is one of the features of an Established Member. Para makapagpalit ka ng profile picture, kailangan mong maging Established Member muna. How? Read this: https://phcorner.net/established/
Also, don't forget to read the forum rules to avoid violations: phcorner.net/rules
Since 2 years have passed since the last reply in this thread, I am locking it to prevent necroposting. Feel free to start a new thread or contact any forum staff if you want this to be reopened.