Using collision is a little more involved than just telling an object to use a certain type of collision method.
You first need to do that, setup the objects to use collision. The, each game loop, you need to test for that collision, and then process the results accordingly.
Basically this is the procedure, first you would detect if there was a collision between objectA and objectB where objectA is moving into objectB and if there is a collision, then you would stop moving objectA.
That is a very basic logic example, but using that you should be able to figure out a coding method.
Also, as a last bit of advice, I would suggest using the "Sparky's Collision" plugin, its free and you can obtain it from the "DarkBasic Pro Collision DLL" thread in Program Announcements. It comes with some easy to follow examples and its commands operate alot more efficiently than the native db commands.
If it ain't broke.... DONT FIX IT !!!