I see that some folks have asked similar questions and responses are simple such as clear out the cache. Maybe for you, clearing the cache is as easy as pi - get it? Sorry, bad dad joke. While for others, such as me . . . you may as well tell me to go start the rocket ship. Here is my issue and hoping someone can help. I just purchased and assembled a Raspberry Pi 4b. All totally new for me. This entire smart home biz is new to me. Having fun for the most part. However, I downloaded the operating system from the Raspberry Pi website onto a micro SD card, loaded the card onto the Raspberry PI, connected an ethernet connection and powered it up. Used my Mac web browser to login to the Raspberry Pi by using http://homeassistant.local:8123. This took me to a screen that indicated it was setting up and to wait about 20 minutes. Then I waited . . . and waited. Like 40-60 minutes went by. I tried to refresh the screen and it showed the connection was lost. I tried power cycling the Raspberry Pi. Used web browser to go to the web address again. It reloaded and a screen to create an account/user appeared. I entered my credentials as it requested. Clicked create (or whatever the button was) and it took me right back to the screen and my entered data was still there. Figured maybe the password had a bad character, so I tried another. Same result. Tried a different username. Same result. I can’t get past this screen. This happened numerous times. Then I refresh the browser and then the connection is lost. What am I doing wrong? How does one create an account? And please, don’t say something like clear the cache because that doesn’t mean anything to me. Looking for some spoon fed advice . . . step by step. Dumb it down.
Not to be pedantic, but you could have simply googled clear cache <browser> e.g. clear cache chrome, if you’re using chrome.
While those words may be meaningless, you’ll have to take time to learn how to figure stuff out with HA. Google will be your best friend.
CTRL+F5 is the fastest way to clear cache without digging into your browser settings to manually clear it.
Secondly, people are going to use big words that you may not understand. I urge to spend time looking over the documentation glossary so that you can properly communicate your problems to people. Coming in here with the attitude “XYZ is meaningless to me” will just turn away people who would be willing to help.
Help us help you.
While your words of assistance are appreciated, clear the cache in what? How does one get to the cache in the raspberry pi? Or is it cache that’s on my browser? And this is the exact reason why I’m asking for specific instructions. I’m not sure how to clear storage cache. Do I remove the Micro SD, load it into my Mac and then clear something on it?
The cache is in your browser, what you’re using to look at home assistant.
The simple instructions are:
CTRL+F5 on your browser. Or google how to clear cache for whatever browser you’re using. It’s different for every browser.
Don’t touch your raspberry pi.
Also, please take the time to learn how to use the forums.
Replying to the thread does not notify the user you are replying to them. Replying to the post does.
i.e.
Thank you. I’ll give it a try. Hopefully, I replied correctly.
You did 
Did you maybe try to create a user with capitals in the username? I just wasted 2 nights on trying everything (different browsers, in-private, cache clearing, different versions of HAOS on my RaspPi) only to discover in the logs that a username can only have lower case. However, it looked like it created something, because when I restarted my RaspPi, I got the option to log in, instead of the onboarding page. I just couldn’t log in with the user I thought was (sort of) created.
Just now I created a user with just lowercase and everything works like a charm.