For advertisers
From your dashboard, Edit ad lets you change your ad's text or image, its link, or your spend cap at any time. Changing only your spend cap never interrupts a running ad.
If the space reviews ads manually and you change the actual creative — the text, image, or link — your ad goes back to pending and comes out of rotation until the owner approves it again. This is intentional: it stops an approved ad being swapped for something different after the fact. Auto-accept spaces skip this since nothing was reviewed in the first place.