Welcome!! And how awesome that you have a dogclub!! I would love to do that!!
Your dogs from what I see are adorable !!! Love the puppy!!
Where do you have your pictures stored? If you are using www.imagestation.com , what I have to do is after you get the pic you want, you right click on it, where it says view pic, click on that. Then copy the address, and paste it in your signature, with the [img] in front of it and [ / img] behind it. (without the spaces)
If that doesn't work, There are some others here that are more puter literate than I am!!!
But welcome!!