After login to your account click the down arrow near the profile image. And select link 'Profile' in the drop down menu. You will get a screen like below,
In this page you have the option to update your basic details like first name, last name, phone etc. Also you can upload a profile image under ‘Profile image’. Edit the required details and click on ‘UPDATE’. Your data will be saved.
Profile Image
Upload your profile image
First name
Edit your first name
Last name
Edit your last name