The Moodle Docs should have this. I went through some pages and found that the information is distributed all over. Here is one place: https://docs.moodle.org/en/Installing_Moodle#Final_configuration
There is even a Gmail page: https://docs.moodle.org/en/Email_setup_gmail, if you still want to follow that.
General developer forum
Manual change in moodle database
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