If you join WikiTree then you will be able to edit any open profile (the one you linked is open, so you will be able to edit it). You will be expected to have a source for any information you add or change, however, and we collaborate here so you should contact the profile manager before making any substantive changes.
We are anxious to improve the information in profiles here and encourage non-members to provide any corrections. Non-members can add a comment on the profile page or send a private message to the profile manager that include the information and the source for it.
Thank you for your offer - I hope you decide to join us - it's completely free.