I should have been more specific, sorry. This is how to see what's on your card. Alternately, you can plug your card into your computer's card reader if it has one. Both do the same thing, you'll see the card appear in your OS' drives, like you would plugging in a flash drive or inserting a disk.
How to upload patch banks: Clicking "add" in the patch bank area opens up the Axoloti folder on your computer. This is where you select the patches that you would like to use.
Once you've selected your patches, they appear inside of the patch bank window like so. Then click "Upload Patch Bank" to upload them to your card. The Axoloti monitor window will tell you if/when they successfully uploaded.
In order to be able to browse through your patch bank, you also have to have a startup patch. Technically it doesn't matter what the startup patch is, but I like to make the startup patch the same as the first patch in my patch bank.
After you have these uploaded, this is where it gets a little tricky. There are a few different ways of changing the patches, depending on your use case. Are you using a "Controller object" for your Axocontrol? If you are, you can put your patch change objects in there, so it works with every patch. This is usually the easiest way to do it.