How to customize topics pages

I successfully create new page under admin/topic list. It's already published at my footer column.
But how do i edit the pages code in html, i want to add text box, image on that page. if i edit on admin side i only can just add the text.  Can anyone help me?

Edit Topic Pages here
http://yourwebsite.com/Admin/Topic/List
Select Advance mode edit
Down the bottom in Display
- Enter your System name for the template which is called up in .cshtml code
e.g HomePageText
used like
        @await Component.InvokeAsync("TopicBlock", new { systemName = "HomepageText" })
used in
src\Presentation\Nop.Web\Views\Home\Index.cshtml

I already create my custom page (FAQ Page) in Presentation\Nop.Web\Views\FaqPage\index
And on the admin side i also create new page (topic) for FAQ.
So how do i link, when i click FAQ link in my footer it will direct to the custom page (Presentation\Nop.Web\Views\FaqPage\index)

You need to customise in cshtml file. Just put a URL for custom page at page footer.