If your internet access is censored, you should download Tor Browser Alpha available for Windows, macOS, GNU/Linux and Android.
You can also use Snowflake with OnionBrowser on iOS.
If you're running Tor Browser Alpha for desktop for the first time, you can click on 'Configure' on the start-up screen and then select 'Tor is censored in my country'.
Click on 'Select a built-in bridge' and choose 'snowflake' from the dropdown menu.
From within the browser you can click on the hamburger menu then go to 'Preferences' and go to 'Tor'.
Alternatively, you can also type
about:preferences#tor in the url bar. Check 'Use a Bridge' and 'Use a built-in bridge'. Then select 'snowflake' from the dropdown menu.