You can make a deposit at any time. New deposits are processed immediately, but can take some time to appear on your dashboard. Give some time to the network.
Please make sure to copy the full address and to choose the correct coin. Addresses will not change once they have been created and are associated with your account permanently.
Don´t ever send coin A to an address for coin B. The blockchains are different and we cannot recover the coins. You will loose your coins.