Hey Chris,
It seems like you missing this `author_alias` columns from #__easyblog_post table.
I've tried to access your site's backend but the credentials are not working.
Username and password do not match or you do not have an account yet.
Please run below mentioned SQL query in your site database using phpmyadmin.
ALTER TABLE `#__easyblog_post` ADD `author_alias` VARCHAR(255) NULL;
Remember to replace
#_ with the table prefix.
If you need help then please provide us with the correct details.