@Mirandakeeling my guess is that you’ll need to add the code to the html head of your Wix site: https://support.wix.com/en/article/embedding-custom-code-on-your-site
Help Center | Wix.com

The Wix Support Center has tons of videos, tutorials and demos available to help you create your free website. Just type in your question and go!

@jpick I keep getting this message:
It looks like you're trying add an unsupported tag. Only <meta> and <link> tags can be used here.
@Mirandakeeling oh, that must be frustrating :/ Looks like someone’s found a workaround here: https://www.simoncox.com/post/how-to-get-your-wix-website-verified-on-mastodon
How to get your Wix website verified on Mastodon

I went through some hoops to get my Mastodon profile verified - here's how I did it.

SimonCox.com