Step 2a: Use the user categories integration

After your content type to be used with node profiles has been created, click its edit option on admin/content/types. You should see a tab called node profiles if you had followed the previous steps correctly.

Turn on the user categories integration for your content type, so you get a new tab under /user/XX/edit where XX is your user id. You get there by the "My Account -> Edit" link.

The described way is only applicable to simple nodeprofiles, which consist of one type. If you want to build a more complex profile, try the solution 2b, which makes use of the pageroute module.