Per the instructions:
Hint: Type $ and the variable name, then press Enter to add a new variable or to select an existing variable from a list of suggestions. The suggestions dialog shows variables already defined in this template.
This is not working in the cloud, using chrome browser.
And now when I insert new variable from the menu, I receive the following error when saving:
'Can't save changes Multiple template variables which have the same name "Country" but different parameters.'
It is the same variable with the same parameters.