Nik_V

Hi @Nik_V,
There is a whole section about Announcements in the Help Guides.
There is a gear to the right side of your announcements where you can edit or remove the announcement altogether as pictured below.

Hope this helps answer your questions.

Please see the following guide: 
 

Split this into a new topic for you 🙂 .
Depends all what you're attempting to do. If you want to add/modify CSS, using the custom.css file in your theme would be advised. If you want to modify HTML in your theme, that can be done as well. For more info on that, can go to:  https://invisioncommunity.com/4guides/themes-and-customizations/getting-started-with-themes_324/introduction-to-themes-r108/
There is also Pages where you can create a whole new page based on your custom HTML/CSS. Which you can read about here: https://invisioncommunity.com/4guides/suite-applications/pages/core-concepts/introduction-to-pages-r149/
However, customizations, such as all the above are outside our scope of support.

Our "Powered by Invision Community" is required per our license agreement. There is a one-time removal fee which you can pay for.
The theme by line, you will need to contact your theme's author. That is not inserted by our core software.

Sorry, there is not direct link but you can go to Client Area -> Manage Purchases -> click your community -> Manage Your Community -> Branding License Removal.
 

This would be done in ACP -> System -> Applications -> Permissions.

There is no single button to switch this off, unfortunately. You can however remove permissions from people being able to report items. So on each of your groups, switch off the "Can report content?" option on the content tab