Go to app store and search "hipporemote" i would suggest getting pro version instead of free.

After installing app on iphone, start computer and go to www.hipporemote.com for pc host

Once done that open hipporemote host and note down your IP address

Make sure both your Iphone and Computer are connected to same network i.e. your wifi network

Start Hipporemote on iphone

Add your connection (pc ip address) refer setup instruction for help.

Once done. Connect remote to pc :) enjoy the funtions

Mouse

Keyboard

Theres much more...enjoy!!!