I used to have trouble too until I found out you are supposed to load them to the site First, put them your album Then you can insert them into a post.
At the top of the page in the black border click on Photos. Then when it comes up go to the right end of the black border and click Upload Photos.
On the next screen you pick browse then select your pics from your phone or computer. Pick One then click Open. Now you click Upload/Submit (you can only do 5 at a time, then you have to repeat the whole thing for more). Then click Process.
Now they are on the site in your photo area. From there is it very easy to put them in a post. When you are creating the post there is a My Photos button at the bottom left of the frame you are typing in. Click that and you can select what you want.Truly this is a pain to do each time you want to post a photo but it is what it is...
Danford1