I am need to use html macro in On demand Jira Wiki Renderer, but the html macro option is disabled in my On demand jira wiki renderer. Please help me how to enable the html option in this Wiki renderer.
JIRA OnDemand doesn't support HTML renderer per OnDemand Restricted functions: https://confluence.atlassian.com/display/AOD/Restricted+Functions+in+Atlassian+OnDemand, that is due to XSS vulnerability that could allow malicious users to gain system administrator permissions and use the OnDemand infrastructure for nefarious purposes.
However, you may need to stick with wiki style otherwise you can consider moving to JIRA in house so you can have many options to customize your instance.
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