What is your background in training?

It's probably how you phrase it.  You can post your email or website and if that's a problem you can use spaces between to share it.  Lots of ways.  But they sell ads, that's why you can't advertise. 

I no longer have a dog but I trained with Wynn Strickland years ago.  I bought a beautiful puppy from her, trained and showed her.  

Yes, thank you.