Can't get it to work at all, only code shows on article

Hi Guys. Love your work.
Have installed plugin, enabled it, inserted the code, images are uploaded in the right folder...should be good to go.
But all I see, instead of the before and after image, is the code I have put into the article.

Please help, what have I done wrong?
I have tried including the whole path, just the image name, etc - same results, just the code showing on the page. Have tried putting it in source code, in the article content, again - same result.

Thanks so much. Link to website page is below:
magicislandphotographytours.com/the-vault/getting-off-auto
magicislandphotographytours.com/the-vault/getting-off-auto

Could you please send info access admin to email support: contact(at)omegatheme(dot)com
I'll check it.

Regards, Kien