Step by step:
1) Right click on the picture (a box will pop up)
2) click on properties (a box will pop up)
3) left click at the beginning of the address (URL) hold the button and drag it over the address until it is all highlighted blue
4) right click on the blue address (a box will pop up)
5) click copy

now come to Pet Talk

6) start (or post on) a thread
7) click the IMG box
8) right click inside the white part of the box that pops up
9) click paste
10) enter (or OK)