The Nearpod product team is currently working on some awesome formatting tools to add to the Nearpod editor, but unfortunately we have not yet finished.
If you want to customize your slides I recommend you use Powerpoint or canva.com, then import those files onto Nearpod as such:
Importing the file as multiple slides:
Without clicking on "add slide"
-Select the presentation you want to edit
-Open up the folder containing the file in your computer
-Click, hold, and drag the file onto the presentation window
Importing the file as an individual slideshow feature:
-Select the presentation you want to edit
-Add Slide
-Within add content choose slideshow
-Open up the folder containing the file in your computer
-Click, hold, and drag the file onto the presentation window
Please let me know if you need further help or design ideas.