Can i turn off my host pc or i should be online all the time
what?
Of course you can turn off you PC, just press the big round button on the case 
Seriously,
- first, there’s no need to shout on this forum (and your font-size is interpreted as shouting by most people, I guess), and
- second, if you want to get some help here, please post sensible questions with full descriptions of what you want to achieve, what you did and what the real problem is.
Best regards,
Christian Meis
buy a web Switch…
http://www.leunig.de/_pro/netzwerk/remote_power_switch/eps_D4.htm
or
http://www.leunig.de/_pro/netzwerk/remote_power_switch/eps.htm
and this do forwarded an your Router OS an you can turn on /off yor PC