localhost:17001, which is the default "mainnet" API port. However, when you run n0_test, your node spins up on
localhost:18001. To point your frontend at your testnet node, however, you must open up your inspector and change your
localhost:18001as shown in the screenshot below. After you do this, you should be able to Sign Up, and everything should work normally.
http://localhost:4201. See the screenshot below: