On the Android version, when a tower has a special ability there will be an icon visible when the tower is selected. It is just under the "sell tower" button. Touch this to activate the ability. It will then show a red disk over the icon that counts down the time until the ability can be used again.
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you can play bloons tower defense on ninjakiwi
Bloons TowBloons Tower Defense 3er Defense 3 money
no
The bloons tower defense 4 track editor will be released around mid-November
http://fliiby.com/get/298422/Bloons-Tower-Defense-3---Distribute-jhttd4p66g.html wait 30 seconds and download =)