To make changes on your profile you may simply follow these steps below:
On your homepage, click your profile image icon located in the top right corner.
Select the "Settings" button, which will direct you to the Plan and Billing section of your account.
This will take you to your Account Details page, where you can update your:
Username
Bio
Change Password
Once you've made your updates, click the "Save Changes" button to apply them.
Registered email associated with your account cannot be changed.