How to connect to wifi without using password?

If you forget your password, you will have to go into the WIFI router and change the password (routers may allow you to see the password in plain text). It depends on the WIFI router, but on some WIFI routers all you have to do is hard wire into the router, enter the router uri in your browser, and then can make changes. Other routers require an admin login and password. There are usually ways to reset the modem so that it goes back to its default. Some of the newer router actually are administered centrally and you will need to contact the manufacturer to make changes.

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How to connect to wifi without using password?

That is the principle of security: you don't connect over wifi without password.
Accessing to wifi router may be easier if using a wire connection, but you may still need password, it details depend on router brand.
Some routers allow password change via a serial connection.
The generic user name is : admin and password is : admin