i can't use trade with my coin

i donated yesterday and till the moment when i try buy anything with coins it says i need to wait 3 days, and i really want to use it now, what can i do?

You can do the following: Wait.

There's no way to circumvent that 72h wait period. You can use your coins for store or service, if you feel like doing that, but char/itemtrade always has those unskippable 72h.