your post is kind of conusing you mention grog and wooshbuild those are two different builds if you want to use wooshbuild then you need to use terminal i.e. putty or
on your Web browser and type
http://zgemmah2s it will open webwif.
Then on the left hand side at bottom there will be terminal press on terminal
a window will open saying login as type root press enter then type this command
opkg install
http://wbuildx.co.uk/setup.ipk
then press enter and install then just continue with setup as normal.
P.S. you must have usb already mounted and initialized to install wooshbuild
or those that already have a USB initalised that as been used in a box before can just select NO where it asks to initialise
For those that haven't had a USB initalised by a box
Run the infinity command as normal
At the start of the infinity setup page press the red button (exit) then the exit button again twice
Now initialise your USB device
Blue button > harddisk > initalisation > select your USB device > red to initalise
Answer yes to `Do you really want to initialise`
Then reboot your box, You should now be returned to the Infinity setup page where you can select NO on initalising and carry