you find the ID by selecting the creation, clicking 'open in browser' and in the url at the top of the screen it will have ID= .......... (these dots symbolise the ID number) EDIT:sorry i said the same thing as locheedmartin. he must have posted that just before i posted mine. no biggie
go to your profile go to view profile go to saves look for the save you want open the save in a new tab copy the number next to the word ID= in the address e.g.