Where? In the gallery or do you want to add them to your post?

Ye I want to add them to a post I need opinions on my acne

OK, that's very simple. You just have to click the "Use Full Editor" or "More Reply Options" button beneath the post (if you want to edit an existing post, you'll need to click "Edit" first).

In the full editor, beneath the post, there's a "Choose Files" button (under "Attach Files"). Just click it and select the file(s). Once they're uploaded, you can add them to your post.

Alternatively, if you have already posted your pictures on a website like Flickr, you can click the "Image" icon in the menu bar (bottom row), and enter the url to your picture.