Enter your custom domain name in this format: [DOMAIN].my.salesforce.com and tap 'Continue'
Enter your Salesforce username and password and tap 'Log In'
*Please note your custom domain page will look different from the example here
**If your custom domain contains "double dashes" ("--") please note that most iOS devices may convert them into a long dash ("—") with auto-correct. Make sure to double check your custom domain URL before submitting it.