Can't delete unopened email on website using bb cu...

Rather than having all my email coming straight into my BB Curve, I'm going to the Verizon website to open it. I cannot find a way to delete an email without opening it first, including spam. (Can do it on a computer but not on the BB.) I had to open an email I didn't want to see and it got hung up - wouldn't load and wouldn't go away. Had to remove the battery to reset everything. How do I get rid of unwanted emails without opening them?

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