Channel customization on Supplier Side

I want to customize the Tech Support Channel shown on Supplier Home page.

In the Tech Support Channel, I want to do the following and make it visible on the Suppliers Home workbench

- Add Support Contact Phone Number

- Add a support email address such that clicking it would automatically open the email application with the email address populated

- Add the powerpoint document with specific Supplier Help document.

Is it possible to do the above? If yes, I would appreciate if someone can provide me more documentation on how to do the above.

Thanks,

Manoj