Go down the page to the place where you post a reply.
The bottom row of icons includes "Go Advanced", click on that.
In the top row of icons, left end, is an icon with an "A" in it and the icon is blue, click on that to turn off the blue.
Now place your cursor wherever you want the pic to appear.
Second row of icons, sixth from the right end is a square picture icon with black dots at each corner, "insert image", click on that.
A window will open allowing you to choose your source, "computer" or "URL". I use computer and click on that.
Lower in that window is a "Browse" icon, click on that.
A window will open with choices in regards to the computer stored location of the pic you want to insert, find that pic, click on it, then click on "open" down in the lower right corner of the window.
You will be back at the first window where you selected browse. Now click on "upload" in that window.
Your pic will appear wherever you placed your cursor.
If you want it to post in a larger size double click on the pic.
A window will appear allowing you to choose a size, I use "full size".
Click on whichever size you desire then click "ok". Your pic will appear where you placed it and in the size you chose.
Easy as Turkey Pie.