MaskFog stores proxies as devices. In the New Browser Profile page set Proxy setting to Custom and open the Proxy page, click Configure Device on a free device and type the type, host, port, username and password in Edit proxy. Check Proxy verifies the exit; Bind attaches the device to the profile.
New Profile → Proxy setting: Custom → Proxy → Configure Device
Open MaskFog and click New Profile on the left. Enter the profile name and the browser and User-Agent settings you want.

In the Proxy section set Proxy setting to Custom, then click Proxy to open the device list.

On the Proxy page find an available device and click Configure Device. The Edit proxy window opens.

Give the proxy a name, set Proxy type to HTTP or SOCKS5 to match the port, then type the gateway host in Proxy Host, the port in Proxy Port, the username in Proxy username and the password in Proxy Password.

Click Check Proxy. Connection test passed with the exit IP, country, region and city means the line works; click OK.

Back on the Proxy page click Bind on the configured device; the profile page now shows the bound proxy. Create the profile and launch it.

Check Proxy, next to Proxy Host in Edit proxy. Connection test passed lists the exit IP and location.
Create and open the profile; the bound device routes its traffic. The bound proxy is listed on the profile page.
Copy the line from the dashboard (Proxies, your plan, the proxy generator) rather than typing it: it already carries the country, the session id and the session length in the username. The table shows what each field holds.
| Plan | Host | HTTP port | SOCKS5 port | Username shape |
|---|---|---|---|---|
| Residential Premium | residentialpremium.quantumproxies.io | 8080 | 1080 | USER-country-us-sid-k3f9a1b2-ttl-60m |
| Residential Basic | residentialboson.quantumproxies.io | 9000 | from the generator | USER-country-us |
| Mobile | mobile-us.quantumproxies.io (also -eu, -as, ww) | 8080 | 1080 | USER-country-us-type-mobile |
| Datacenter (per GB) | datacenterboson.quantumproxies.io | 9999 | 10000 | USER-type-datacenter-country-de |
| IPv6 | ipv6.quantumproxies.io | 1001 | from the generator | USER-country-us-package-ipv6 |
| ISP (dedicated IP) | the IP of your line | 8000 | on the plan page | the line's own login |
The password is the one the generator prints next to the username. Pick HTTP or SOCKS5 in the tool and use the port of that column; a port from the other column is the most common reason a check fails. USER and the session id are placeholders for your own values.
A slot that holds one proxy line. You configure it once with host, port, username and password and bind it to a profile; one device per profile keeps IPs separate.
Both. HTTP with the HTTP port of your plan, SOCKS5 with the SOCKS5 port, same host and login.
Edit proxy has separate fields for host, port, username and password; paste each value from the generator line.
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Connect in one command: npx -y quantumproxies-mcp