These instructions are for PPTP VPN. OpenVPN instructions are here.
First, disable IPv6
Step 1 of 3: Select Connectivity->Network in the Synology Control Panel
Step 2 of 3: Click the Edit button
Step 3 of 3: Select the IPv6 tab, “off” in the dropdown list, then click the OK button
Now configure the device for PPTP VPN
Step 1 of 5: select Application Settings->VPN
Step 2 of 5: select Application Settings->PPTP (OpenVPN instructions are here)
Step 3 of 5: enter some descriptive text for Profile Name. For servername, username, and password, enter the values given to you at purchase time, or log into the Control Panel to retrieve them.
Step 4 of 5: Select MS-CHAP v2 for authentication. Select Maxmim MPPE (128 bit) for encryption. Check the first and last checkboxes.
Step 5 of 5: click the ‘connect’ button to ensure you’re able to connect
To confirm it’s working, visit https://getfoxyproxy.org/geoip and ensure it says a different location and IP address than you expect.
To Disconnect, navigate to Application Settings > VPN and select your VPN connection. Click on the Disconnect button next to the status information.