I would like to know how can I identify that a checkbox is selected and then do something.
for example: I select the checkbox
"Google" and then I click on the button "Go" then the app opens to the page of Google.
Apologize advance if has not learned how to express myself.
Assuming you are talking about an AppleScriptObjC application declare two properties
property googleCheckbox : missing value
property appleCheckbox : missing value
In Interface Builder connect the outlets of both checkboxes to their properties
Then get the state
of a checkbox with
set googleState to googleCheckbox's state() as integer // 0 is off, 1 is on
Alternatively declare two boolean properties instead
property googleState : false
property appleState : false
and bind the value of a checkbox to the property. Then you can get the value directly.