radio414

So on the cardmaker if you click on the card you've made, you should download a .png file (an image) of the card you've made. That's step one.
Step two is to go to an image hosting website -- imgur.com is the standard -- and upload the image you've downloaded there. No need to make an imgur account or anything, there should be a button at the top that says "New Post". Select "Choose Image/Video" from among those options and then find the file you just downloaded and select that.
Step three getting the image back onto this site. Once the image is uploaded, you can right-click on it and select "Copy Image Address". When you're making a post, you can past that address in and the editor should automatically turn that into an image.
I just did these steps on Windows using Google Chrome as my browser, using the default card -- here's what it shows up like:
but the steps should be similar on other browsers and operating systems.

I'm on Chrome, so I don't know if this'll be the exact same experience, but:
Clicking "save" should download a ".json" file, correct? This is what the card maker uses when you want to reopen or make edits to a saved card. If you want to save a picture of the card for, you know, whatever else, you should just be able to click on the image of the card itself, which will download a .png file, a format Windows 10 should be happier with.

Looks good for me now