Here's how I do it. Relatively easy and the steps are intuitive.
If you don't already have it, download the Google Chrome App to your IPAD.
On your IPAD open Google Chrome.
On your IPAD in Google Chrome open and sign in to your Google Account.
Open your "Google Photos".
Open "Upload" at the top right corner of |Google Photos - a menu box will open.
Select "Photo Library". These are the photos from your IPAD.
Go to the "Camera Roll", 'select' the photo, press "done"
The photo will upload to Google Photos. Add the photo to an Album for ease of locating again.
Now go to your Google Blog, still in Chrome - on a new tab.
Your Blog is in the Blogger App in Google, or search for your Blog or type in your URL to bring up your Google Blog.
Open the Blog you want to post the picture on. This one is called Backyard Garden. Open "New Post".
Open the "Add Images" square just above the line around the content box.
The "Add Images" box will open.
Open "From Your Phone" and your uploaded IPAD photos are visible. You may also find them in your Google Album Archive. This may take a few seconds to open.
'Select' a photo and press "Add selected". It will appear on your blog page.