On your computer, go to: instagram.com/ then enter your username.
Click on the photo you want to embed.
Click on the rectangle with the arrow coming out of it.
You will get an "embed code." Copy it. Then go to your website or blog.
Paste the embed code on your site. Make sure you are on the HTML tab.
Once you save it, it will look something like this. This one is on my blog. Enjoy!