You have to have a place on-line to store them, most internet service providers give you some storage space for this. Contact your provider and ask if they have space for you and then ask how to upload them. Everyone is different so we can’t tell you how to do this, you need to go to your provider.
The second part is to link to the picture you want to show. To do this, once uploaded go look at the picture and when it’s on your screen, right click on it use the “copy image location" tab. Then when you make a post, go to the full reply screen and the 4th box over from the left above the reply area, click on it and I then click on the first line in the pop-up menu (insert a non floating image) then paste the address in the box.
To check it click on preview post to get a look at your post before you actually post it.
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You can run, but you'll only die tired.