Please see this article if you are looking for a more detailed introduction to Punch Clock.
Go to Settings > Punch Clock > Employee Access > "Add".
Copy ”Current IP” to the box below and click ”Save”.
If you need to update the IP address regularly, it may be because your internet provider has you on a 'dynamic IP'. To avoid changing IPs you can contact your provider and ask them to switch you to 'static IP'.
If you do not see the current IP on the page, go to myip.dk and find your IP address there. Your public IP address will also be the first result when googling “IP address".