Working with Dish-Washer

Me and my friend are living together here since last four months. In fact i am living here since last 9 months. But during this whole duration we never tried to use our dishwasher in this whole duration. There were two reason for doing that, first we have never saw the dishwasher before and hence never used that. second, we were not aware about it's working functionality (basically myself).

But from last three weeks, we are using the dishwasher and found it very useful and time saving utility that now we are cursing ourselves why we were not using that before. But is not like every thing is happening fine from starting with dishwasher. First time when i tried to use that i have put three spoon washing powder. End result was, it overflowed and i had to waste one full hour to wash the floor.:) But after that i was keeping in mind about the quantity of washing powder.

But today again same thing happened despite of using less amount of washing powder. I don't know why that happened but have to know that. Any way time to clean the floor again.:)