What is this means in my case?

Don't really understand you buddy..

o he means the bottom plates at the bottom that can be taken out like pci slots. to be honest man i think its for wireless antennas or a hdd extension. my hp has a external thing like that for media attachments. or you can put another cooler of some sort. remember hp uses alot of the same cases for different builds.

http://www.specialtech.co.uk/spshop/customer/Zalman-Sys...

things like that?, yes you can put one in either of those slots man,
Moto

Don't you see the bottom plates???

The wireless card is installed, and the blower fan must install where the pci slot in order to install the metal end like when you install a video card

It looks like a space for a blower, but the picture doesn't show any place it can screw onto. There's no screw-hole that accommodates the 90-degree flanged metal section. You'd probably want a fan that mounts like the crossflow fan for the Silverstone SG-02 case:

http://www.sundialmicro.com/Silverstone-cross-flow-fan-...

you are right
PCI blower need to fit like when you install a video card

this blower sound odd, I dont think it will fit coz it's look like for specific model

Regards

Using a pair of pliers, bend the retaining clip (the small part at 90 degree's to the rest of it so its in line with the rest of it then screw it to the case

Probably a better picture to demonstrate,
http://www.xoxide.com/evercool-fox2.html
that little 1cm tab? bend it so that you can screw it to the case
Moto