I want to run this tool from Qgis 2.2 but i don't know how to use the PARAMETERS to run this tool.
The red frame are the PARAMETERS I don't know.
Can someone to tell me what those PARAMETERS are and what they mean?
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If you look closely, not all of those parameters are required. To obtain the watersheds, you simply need to specify the input elevation model, a name for the output basins map and a threshold (cell units) to tell the software at which level to aggregate subwatersheds. In the worst case check the r.watershed manual which is also in the "help" tab of your screenshot ;-)