I am trying to ask a question on https://developer.salesforce.com Discussion Forum, but there is no link/button to ask a question there.
Please guide me as to where can i ask a question there...
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Before addressing your directly question. Why not ask your question here on the Salesforce StackExchange? The Official Salesforce Developer Forums and this site fill a similar role. The primary difference being that this site follows the StackExchange Q&A format (like StackOverflow) rather than being a free-for-all forum.
Assuming you are signed in, which you appear to be, there should be a box at the top that prompts:
What would you like to know?