Are your pics in your computer? If so look below where we write, You will see a GO Advanced button. This leads you to a place to add pics to your post.
Scroll down to fin the Manage Attachments button.
This brings up a window full of browse buttons. Click one, this takes you to the Pics file on your computer.
Below the browse buttons is a list of pic formats and max sizes. Most photo programs have a way to resize pic. resize to the max size .
Once find a pic you want just hit the upload button.
Once uploaded a pic shows up in the post.
Kinda like this.
Leo