how to bios clear ME region ???

how to bios clear ME region 6th 7th dell 3559 ( 14236-1 )

More info is needed here. First what is 6th 7th Dell 3559? IS that one Dell model 3559, if yes what do you mean by 6th 7th?
What do you mean by clear ME region?

If you mean clean ME region, due to corrupted or bad update etc, here is guide - [Guide] Clean Dumped Intel Engine (CS)ME/(CS)TXE Regions with Data Initialization
And here is system tools packages with Intel Flash Image Tool, in section C2 you want version series that matches your current ME - Intel Management Engine: Drivers, Firmware & System Tools
And here is ME FW Repositories - Intel Engine: Firmware Repositories