Can't get mywebcalls to work

Hi,
I've been trying to make a call on mywebcalls, but I can't seem to get
it to work. I've tried the PC dialer, but it doesn't connect to
mywebcalls and when I go to the page for the web dialer
(https://www.mywebcalls.com/rw/login) it says Loading.... and never
comes back.

Is anyone else having this problem?

or am I not getting something.

Joaquin