You can edit a report by passing security token, report ID and design=1 to ReportPortal/Proxy.aspx page. You can set the Security Token mode by going to Admin > Settings > Security > check "Enable URL Integration" and select "Security Token" mode. Proxy.aspx supports three Security Token modes:
You can get the Security Token by using this SQL:
Assuming you are using HTTP Get Security Token mode, once you have the Token you can pass it along with the report ID to Proxy.aspx page: