At the top of the page there should be something that says "User CP", click on that.
After the page opens, on the left hand side the top option is "Edit Signature", click on that.
A box will open up, it will look similar to the same ones you post in, this is where you are going to want to put the image code.
without the *, it will look something like this
To get that image code you should do like we said before, right click on the image and copy the "address" and then paste in to the sig box or whatever else you want.