How to reset Permalinks and Question

Hello everyone!

i have a question regarding permalinks. I’m running a woocommerce plugin for e-commerce and it’s apparently broken. someone recommended resetting the permalink structure might fix it, however I two questions:

1. Will this remove all custom URLs I have created so far ex. http://grahamclarkphoto.com/review-canon-eos-6d/ or http://grahamclarkphoto.com/alaska-to-argentina

2. How do I reset the permalinks? I see nowhere to do this under Settings > Permalinks : (

Graham