From the time you register, you should be able to insert images in your posts.

When you have the wysiwyg editor open, look in the second row of icons below the "Title" input field. Find the image insertimage.png, click on it and find the image on the web or your computer.

If you are using TAPATALK, try clicking on “quote”. Then find the camera, picture, etc. beneath the reply screen. The picture will take you to your library, I choose the camera.