You can update the information on that page by clicking on the
Edit page button at the bottom of it and filling out the various forms that apply on the Update page.
You might want to check the
Data Submission Guides for the various sections before trying to update them. These guides and a lot of other helpful pages are all linked from the
Contributor Zone, which you might want to bookmark for future reference.
One warning: IMDb will not remove valid information, so be sure you want it permanently publicly visible before adding it.
Much of the Biographical data is accepted without need of confirming URLs, DoB being the major exception. For Date of Birth, they now need authoritative data, preferably a government document. (They don't accept the word of the person involved as too many people (primarily actresses and to a lesser extent actors) have 'adjusted' their ages for various reasons.)
IMDb's preferred document is a passport, though they well accept some other ID. You can scan this, upload the scan to a site that they can access without needing to log in, and include the resulting URL in the form. (You might consider using Dropbox, as it allows you to set access so that someone needs the exact URL to see the page, and you maintain complete control over it so you can delete the page as soon as the data is accepted by IMDb.)
If you want to add Contacts, you will need access to a Pro Account (but any Pro Account will be able to submit updates to your page).
If you want to create a separate Resume page, or upload photos, you will need to upgrade to a Pro Account and use it to 'claim your page'. See
IMDb Resume Frequently Asked Questions for more information on this service.
