Yeah this is a forum for the Atahualpa and Montezuma themes but I'll give you some advice
Backup the database and all the files beore you do anything else. Seriously, do a backup. That way no matter what you do, you will be able to get back to what it looks like today.
Once you have done the backup, then disable all plugins and try. If you still can't add a post, swap the theme to twenty-sixteen and try again.
Actually if you really don't knw anything about how to do a backup or how wordpress works, you - and the school need to find someone who does and probably pay them to figure out what is going wrong. The more things you try, the more you might make the situation worse.
So...have you done the backups yet?
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Juggledad | Forum Moderator/Support
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