If you are going to use OpenSea Go to your item page on OpenSea => click on Share icon => then click on Embed Item. You can put this code to the Elementor code module.
Does the theme support custom fonts? Can I use my own font? Yes, you can choose any in Elementor Global settings to set globally or change only on a specific demo.
How to update the theme? Just install the new version as regular theme (without demo installation). Feel free to ask for support if it’s not clear!