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I don't think you can. One way is by explicitly emailing support and asking them to delete it, but since you're using a a free trial, i'm guessing you cannot delete the account, probably just to avoid the issue of individuals reusing the trial. If you're trying to upgrade, you can log in to your AppD account and go to the top left corner go to Licenses-> Overview-> Contact Sales. If you do need an extension theyu do provide an extension of the trial if AppDynamics seems you're suitable for one.
I hope this helps! :)
I've sent you a Private Message within the Community, please check it out and get back to me so we can further look into this for you.
Ryan, AppDynamics Community Manager