If you have the Gold-level plan or higher, you could use the Fixed Position Element feature to pin your footer information to the bottom. Here's a video about the Fixed Position Element feature.
If you'd like to add your company logo with a hyperlink to the Viewer Display, the bar at the bottom, you can create an SVG that you can use as your Viewer Display logo. Here's more info on how to create the SVG:
How to Add a Hyperlink to an SVG File From Adobe Illustrator Print
When you export, go to in5 > Export HTML5 with in5... , go to the Viewer Display section), and click the Browse... button to navigate to your logo. You can use a regular logo without a link and add it the same way.
For additional branding, you can change the color of the Viewer Display frame by selecting a Frame Color.
Hi again! Sorry, it doesnt´t work. My content always appears in this little space on the left side of the footer. I tried everything. Maybe it just doesn't work?