Default username and password for Quickstart package is:<br><br>username: admin<br>password: abc123<br><br>Did you try it?
thank you, it is solved by this answer
Glad your problem has been solved!
I have the same issue except it looks like the default user name and/or password above has changed. Please help.
Please try with
Those credentials are incorrect. The default is “admin” and the password is blank. However, when you try to enter that after the back end has been installed it won’t accept a blank password. It automatically throws an error. The only way to correct this is to reset the hosting account, re-install and be mindful to enter a proper user name (or accept “admin”) and password.
There is no blank password, when you leave blank for admin settings during install, you have default login as admin and ‘abc123’.
You also can follow this guide to reset the password https://docs.joomla.org/How_do_you_recover_or_reset_your_admin_password%3F