After 24 hours have passed, you can't edit your post anymore, if you want it editted, you can message one of the marketplace minions if it's in the normal marketplace ( @Dave's Sheep #2 @Arun's Panda @Flengo's Camel @Liz's Anti-Semitic Camel ) or if it's in a sub-marketplace, you could mention one of the section's minions, since that's LoL, then you could mention @Cataclypse
Hope I helped.