Step2: Go to your profile page by tapping your account symbol in the lower-right corner.
Quick tip: If you have numerous Instagram accounts and want to change the password for one of them, tap and hold the account symbol at the bottom of the screen until a pop-up appears, then select the account you want.
Step3: Select Settings from the three horizontal lines symbol in the top-right corner of the screen.
Step4: Select Security.
Step5: Tap Password on the Security page.
Step6: Type your current password, followed by the new password you’d like to use. When you’re finished, press Save or the checkbox