my bog replaced with astore page Iwant my blog back

ahh crap!! obveously I’ve done this but Idont know how
I now have amazon’s astore blog where mine use to be on my web it also is on my home page
can anyone help me fix this please bear inmind I;m a newbie at this and have been, no doubt where I’m not spoze to be. I just want my site back to its former glory

flaminhard