Use a title naming the page or tool and the observable problem. In the post, state what you expected, what happened, and the shortest steps that reproduce it. Include a small synthetic input and exact error text when relevant.
For visual issues, add browser, device, viewport size, and a redacted screenshot. For a service failure, include the approximate time and time zone. Say what you already tested so helpers do not repeat it. Remove passwords, tokens, private documents, and identifying links before posting.
A focused example is easier to answer than a long story without a test case.