Where is the embed form button?

Embed button inside of Form Builder is replaced with Publish button. 

https://www.jotform.com/blog/177-Announcing-our-new-simplified-Publish-button-And-embed-codes-are-SSL-by-default- 

If you want to add your form to webpage, please check this guides: 

https://www.jotform.com/help/34-Adding-a-Form-to-a-Web-Page 

http://www.jotform.com/help/67-Which-Form-Embed-Code-Should-I-Use 

Hope this will help. Let us know if you need further assistance.