Yes. An event manager from a charity or other entity can manage the Fundraising Pages (FRP) of the event participants.
Simply go to your event portal. Click manage next to the event.
Go to MANAGE/Manage Fundraisers
Find the page you wish to edit or update
Click manage
Add either a hero image or a profile image (or both) or change the text in the text box
NOTE: Fundraising Pages will display a default image if you have uploaded one in Settings/Fundraising Pages/Fundraising Page images
Participants can also edit their own Fundraising Pages by logging into their mycause account. Once logged in they will see edit buttons on their page