Embed feature is if you are using an image hosted on another site like my Image Event picture hosting site.
If you are uploading an image from your computer or phone you want to use the upload feature.
I made a couple posts in the Test Forum previously on this subject
This one steps through uploading images directly to Ag Talk
This one is the embedding method if you already have the pictures online say in a photo hosting album somewhere.
Not quite as detailed as what the image tutorial had but hopefully enough to walk you through the steps needed.