I see what you are trying to do. I don't think you need BitInstant. Deposit money as outlined below and then buy the bitcoins on BTC-e. You can send the bitcoins from BTC-e to any wallet.
Go to "Finances" and click on the "Make a Deposit" button for the currency you want to send to BTC-e in order to see the options. The options for euros (for example) are: Perfect Money and International Wire Transfer.
If you still want to get a BTC-e coupon, read this:
https://btc-e.com/news/63