I believe you have created an account on Atlassians open Jira, not the Jira On Demand. If you did you would typically had a url like account.atlassian.net (http://www.atlassian.com/licensing/ondemand-faq-existing-customers#general-5).
If you want Jira On Demand you should sign up here: https://my.atlassian.com/ondemand/signup/jira
I have followed following step.
Step - I
I have created my account on https://jira.atlassian.com/secure/Dashboard.jspa
I have stuck here because there is no administration link here. I have logged in as a user.
I want to be administrator of my project so I will be able to give permissions to developers & users.
I haven't installed any UI on my system. because it is for 30 days. I want to use JIRA online as a bug tracker like bugzilla.
Now tell me, what I have missed. I have suggested that I should go with user documentation but first line of documentation is
"Log in as a user with the 'JIRA Administrators' global permission"
Thats why I am asking again and again that how will i log-in as a administrator.
You're looking at the wrong system. See your question (which has turned out to be a duplicate) https://answers.atlassian.com/questions/53603/how-to-add-as-a-administrator-in-jira-how-to-add-product-in-jira
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