The Add Event button should change to Add Action, and the On Release properties should appear on the right side of the Actions tab. Press Add Action and choose Play from the menu. The type text object will be typed out onto the screen then the movie will stop because of the stop action at frame 17. Now move your mouse over the type text object and click and release the mouse button. When the mouse is released the movie continues playing because of the Play Action that is triggered On Release.
Press stop on the toolbar.
Press Add Action and choose Stop from the actions menu. Press OK on the Action Properties menu. Press Add Event and choose On Press from the menu. Press Add Action and select Goto Frame from the menu. Press Add Action again and choose Goto URL from the menu.