If your question has been correctly answered by another user, mark the correct reply as the solution. You can do this by clicking on Best answer.

If you resolved the issue yourself, add the solution as a reply to your topic, and mark it as the answer.

The answer will be shown at the top directly below the question:

It will also be marked with an Answer label on the original reply:

This shows that this question has a valid answer. It might help somebody else with a similar issue!