If you have obtained a 30-day evaluation license for a download product such as JIRA to install on your own server, then you don't need to do anything. At the end of the evaluation period if you decide not to purchase the software the license will expire and you will not be able to use JIRA until you have updated your license.
If you are evaluating Atlassian OnDemand, your evaluation will convert to a paid subscription at the end of the evaluation period and the credit card you supplied on sign up will be charged automatically (unless you've requested an Annual quote from the sales team). If you want to cancel your OnDemand evaluation, you will need to do this via https://my.atlassian.com/.
I hope this helps.
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