Reaching WeTheNorth requires Tor Browser. Reaching it safely requires installing Tor Browser correctly the first time. This reading is a short checklist to work through before you paste any onion address.
Download only from torproject.org
The official source is torproject.org. Any other download page is either a mirror you cannot verify or a fake distribution with modifications baked in. If you land on a Tor Browser download page that is not torproject.org or its onion counterpart, close the tab.
Verify the signature on the bundle, first time
The Tor Project publishes a GPG signature for every download. Verify it against the Tor Project signing key. The download page walks through the check for every operating system. Skipping this on the first install is the easiest way to end up with a modified browser that leaks your traffic outside Tor.
Set the security level to Safest
Open the shield icon next to the address bar. Set the security level to Safest. This disables JavaScript on all sites. WeTheNorth works fine on Safest because the login flow is HTML forms, not React apps.
Do not resize the window
Tor Browser opens at a fixed window size on purpose. Resizing makes your fingerprint unique and identifies you across sites that measure window size. If you accidentally maximize, close the window and open a fresh one.
Do not install extensions
Every extension changes your Tor Browser fingerprint. Ad blockers, dark themes, translation tools, all of them make you look different from a stock install. Leave the browser exactly as it came.
What Tor Browser will not do for you
Tor Browser is only the browser. It does not stop your host operating system from talking to Google, Apple or Microsoft in the background. For anything beyond casual use, run Tor Browser inside Tails on a USB stick or inside a Whonix workstation. This is beyond the scope of this reading but worth knowing.