With the builder you are on, the only way to do that would be to upload an image of an Instagram badge and link that to your profile.
My other suggestion would be to look into rebuilding your site on our newer builder, Website Builder, which does have more social media options that the builder you are currently on. It is also a more modern and updated responsive builder. I recommend looking into it.
In your Homestead account, click on the Websites Manager tab and choose "Add New Website". It will have you give it a temporary site name. Once you are done building it, you can switch your domain name over.