Gerardo, I had problems with the Secure button also. I could not link my Updox account and AC. What I had to do was to start the AC Auth Service. (go to Start, Control Panel, Administrative Tools, Services to get a list of services).
Once that is started, you should be able to link the accounts. You will need to provide your Amazing Charts client log in (what you use to log into the AC Client Portal). Once linked, you will need to activate the Direct Trust to verify your account.
Wayne New York, NY Hey, look! A Bandwagon! Let's jump on!