weight based shipping not working

Hi,

I manage to install and make my site workable using responsive theme.
The only problem is now “weight based shipping”. I have followed all the tutorials and forums but haven’t found anything related.

1. I have already change my default currency to £(pound) but it is still showing $(dollar) in “Tax & Shipping > Weight based shipping”.

2. There is no indication whether I have to add weight in grams or Kg in “weight based shipping” option under “Tax & Shipping”.

3. I have entered the weight in kg in shipping options with price but when I checkout it isn’t calculating and adding the shipping charges based on weight.

Because of above reason I had to keep my site disable which I would really like to make it live asap.

you can check the site with subscriber details:
login url: https://www.hogmall.com/wp-admin
user: guest
pass: imguest
Once login>you will see oops msg>go to hogmall.com

Look forward for the resolution.
thanks
Manpreet Singh