When making a post, click on the paper clip just above the text area
It will bring up a screen that says “Manage Attachments”
Click on “Choose File”
This should take you to the file where you photos are stored.
Select the photo you want to post and click on “Upload”
Now go back to the post you were writing and click on the paper clip again. Select the file and it should be inserted into your post.
To make sure, select “preview post” before actually posting.