How to add custom png background in Fulton

Site URL: http://mrsnancygallardo.com

👋 I've been trying to add custom shapes to this specific section on my website but I'm having a hard time right the correct code, this is the DIV ID for the page section

<div class="content page-content" id="about-page" data-url-id="about">

          <div class="content-inner has-content" id="yui_3_17_2_1_1617112262537_679">

At first I thought it was easy enough to create a html code of an image to place in the Advanced section for the page but this didn't seem to work at all

<img src="https://static1.squarespace.com/static/58d0368615d5db2498ec43cf/t/60625e5088bf3c3f148c17da/1617059409085/doodle_13.png" alt="doodle_waves">

I need help 😕

also... any advice on how to use SVG, I've been uploading png to the back end and its working just fine just wondering if there was a better way. 

PASSWORD 2356

Here are the links to the shapes:

https://static1.squarespace.com/static/58d0368615d5db2498ec43cf/t/606336051ae57b47cc527cfc/1617114629604/doodle_8.png

https://static1.squarespace.com/static/58d0368615d5db2498ec43cf/t/60633609db2c3c481d735702/1617114633871/doodle_13_blue.png

Hi. Which section do you want to apply? I don't see above section in the link.