Re: Building a webcomic navigation template or system

Hi Jordan,
 
By default, Web Site Design Tool helps simplify the design process.  There are many available gadgets in the Web Site Design Tool such as  the HTML gadget.
1) We can insert images directly on the webpage. Also, we can add custom HTML code including hyperlinks to images, a web page, a document or an email address via HTML gadget.
2) We can configure the web page properties to define the navigation position about it.
1. Log into website via the link: http://yourwebsiteaddress/Pages/Forms/AllItems.aspx
2. Click Web Pages, select a web page, on the Ribbon, click Properties under the Manage column.
3. On the Choose page properties page, under Navigation, Click Edit navigation position.
4. Select the specify page under Place page under, and adjust the position under Page order. Click OK.
For detailed information, please refer to create and customize the public-facing website.

SharePoint Designer 2010 can help to customize and build solutions for SharePoint Online.
References:
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Get Started with SharePoint Designer 2010
Customizing SharePoint Online with SharePoint Designer 2010
Note: We don't recommend users make changes to master page.
 
Thanks,
Ida Qiu