First, Hover over your profile picture on Home Page, a dropdown menu will appear.

Click on "Settings" and you will be redirected to your Dashboard Page,

To manage your account information:

1. On Dashboard Page, click on Edit general account info.

2. On this page, you can manage your personal information.

To manage your billing details:

1. On Dashboard Page, click on Subscription.

2. You are now on General Subscription Page, you can change your PLAN 

3. Also on this page, you can update your credit card details below.