To make a dialog box you need a few variables to do this select "module" "trigger editor" and then "variables" now select "create new" now in this you will need to do the following:
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1.) Create a variable of type "Dialog" (this variable will represent the dialog box itself) name it "dialogone"
2.) Create another variable of type "Dialog Button", for every button your dialog is going to have. name the first dialog button "button1" and the second one "button2" and so on. (this variable represents every individual button in the dialog box)
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Now that you have created your variables for your dialot box (step 1) and your button(s) (step 2) your ready for the trigger that initializes the dialog box. the trigger should read as follows:
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Events: [put your event to initialize the dialog box here. [Example: Time - Elapsed game time is 1.00 seconds]]
Conditions: [none needed]
Actions:
Dialog - Clear dialogone
Dialog - Change the title of dialogone to "Some text"
Dialog - Create a dialog button for dialogone labeled "Text to show on button"
Set button1 = (Last created dialog Button)
Dialog - Show dialogone for Player 1 (Red)
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note: for multiple buttons repeat the third and fourth steps changing the button in the fourth step to button2, button3, etc.
now finally making the buttons on the dialog box do something.
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Events:
Dialog - A dialog button is clicked for dialogone
Conditions:
(Clicked dialog button) Equal to button1
Actions:
...what you want to take place when your dialog button is clicked...
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if you have followd these steps as i had them you should now have a successfully working dialog box. if you have any problems feel free to pm me or write me an email.