Hi Geoff,
In order to do so you must go to the form that you would like to use to edit your profile and open the CRM Form Configuration widget. Depending on the CRM Entity chosen, you will be given the option of using the current logged in user's Parent Customer ID (Account/Contact) or Contact ID (Contacts). Doing this will populate the form with the user's details based on one of those IDs.
You can find more documentation on the CRM Form Configuration Widget
here.
If you have any more questions please don't hesitate to ask!
Kind Regards,
Chris