Capital one Secured mastercard cancel?

okay so this is probably a really stupid question but i dont know like anything about credit or anything so i applied for a capitol one secured mastercard and i was approved and stuff but a few issues came up and now i feel this might be a bad idea. so it says i was approved and need to pay a deposit but i dont see anything about how to cancel this? uming i even need to? i havent done anything but applied so is it just like i dont pay the deposit and they drop the app? does that hurt my credit? please help any help would be greatly appreciated