How to embed a Power Bi in a blog post:
Publish your report online in the Power BI service
Open your report in the Power BI service
Select: File > Embed report > Public to web (public)
Copy the HTML code provided
Create a blog post and select 'Insert HTML Code' and paste
Play around with the Height and Width within the HTLM code to ensure it fits well within your post (this example is W= 500 and H= 800)