Unable to launch GVL on AWS cloud

I am new to Galaxy and I am trying to setup a galaxy on AWS cloud.
So basically I am trying to launch the GVL appliance in Cloudlaunch but I am not able to launch it (the same for Galaxy cloudman). When I input everything, I just cannot get the launch button working. It is always greyed out and when I put my cursor on it, a stop sign will be shown.

Can anyone tell me why would this happen? Thank you so much for your help!