1 . Open Safari and go to Safari > Preferences
2 . Select the Network > Advanced > Proxies
3. Select the proxy you want to edit on the left side of the page (HTTP/S)
Add endpoint in the Address field (e.g. proxy IP:1212(port))
(Optional) Change the bypassed sites in the Bypass field
(Optional) Insert sub-user username and password in the Username and Password fields
4. Click OK
5. Select Apply
6. Check the IP – https://www.iplocation.net/