If you need to update or change your Channel Profile page, there are two easy ways to do this: Edit your existing Channel Profile page or Replace the Channel Profile Page. 

How to Edit a Channel Profile? 

1. Edit existing Channel Profile page: Find the page within your Page Center tab under the Content section > edit the page as needed > Save & Publish. The edits will then be reflected on your Channel Profile page. 
2. Replace the existing Channel Profile page: From the Admin view, click on the Channel Profile tab under the Channel Settings section > click on the Red X icon to remove the current page > click on the Search icon > search for and select your profile page > click on Save.