It looks like you've still got your product set on Draft which is the reason why this wouldn't appear in the theme editor. You can go ahead and set this product to Active by :
You should then see this product appear in your theme editor. Let me know if you run into any issues when completing the steps above.
It looks like you're new to our platform so I would love to recommend taking a look at one of our email marketing courses we have available on our Shopify Learn site. Here is a link to a great email marketing course on growing your email list and building your audience.
A great free tool we have in conjunction with the course above is Shopify Email. Shopify Email is our in-house email marketing solution to help you create email marketing campaigns. You're able to design your emails to match your brand and share links directly of products on your store. You can send 2500 free emails a month, and any additional email at a cost of $0.001USD (So 1000 additional emails would cost you $1USD).You can find all the information related to Shopify Email through this help doc!