is it possible to restore EVERYTHING to default settings???

I think I really messed up something, because none of the links in my post work (even though in html editor it has the proper coding) and also the read more link goes straight to 404 error message, and a picture that i have which i made sure to erase all links to, so that it’s just the img src code makes the address in my browser double up so that it says the address twice and then obviously gives me a 404.
I am using neutica, and i know i was messing around in the editor.
I think i should just restore to default, is this possible?