All you need to do is log in, then you can add your film profile in My profiles, and update it at any time.
If your profile already exists but you don't yet have access to it, first log in, then go to your profile and click Edit profile. Access can only be granted if you are authorised to publish details on a profile. When your access has been authorised, you will be able to update your profile at any time in My profiles.
If you're not yet registered, it's free to register and only takes a minute.