Woocommerce shipping problems

This is our website http://www.nextfactor.com.sg

Currently we are doing delivery only locally in Singapore.

Our delivery charges are as follows: $10 per delivery but free for $50 & above. This is already done and is working , for $50 and above it will automatically states the shipping is free.

But now we are adding another option of local pickup which will be free if they come to our showroom to pick up, so now in the checkout how can i make it that the user can choose the option of local pickup? because now cant choose.

Thanks