Account profile- add extra fields

I would like to have the members first name, last name and company name to show in the account profile section.

I currently have the standard information with the
-Username
-Country/Flag
-Joined
-Last Online

I would like this information to be available for viewing by all registered members in the View Profile section. I have tried adding them into the registration page but they do not display in profile after registering a new member.
I have also added the first and last name in the edit profile section but they still dont display in profile.
Can someone pls help??