Once you've logged in, you can edit any of the fields in your profile, including the photo you'd like other users to see.
Go to Profile located in the bottom right corner and then click on Settings on the top right corner.
Then click on Profile and choose Edit Profile section. Once you're there, you can edit the various fields including:
First & Last Name
You can also edit the About me information directly from your profile by clicking on 'Edit' on the right corner of 'About'.