Apex Oracle 4.2 - How to edit the page template HTML - oracle-apex

I can't find the proper way to edit the HTML of the page template I'm using. What I want to do is to edit the "Welcome User" section on top right of the page, and add a dropdown menu to add some functionalities for the user, like a "Change Password" section.
If I go to Application Builder -> Application -> Shared Components -> Templates I can see the HTML of the body section, but I'm not able to edit it. When I save some edit I'm always getting this error that says that the page does not work.
Thanks.

This error is caused by the new version of Chrome browser but all changes you did in the template was saved in database.

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I can't believe the option was in front of me on the screen and I didn't see it...
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