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How to get unbanned from a web forum
Read your ban message.
If it says you have been blocked forever, then you want to follow the below steps. If it says the ban will eventually expire (for example, a 1 week ban on the 1st would expire on the 8th), then you may want to wait until it expires.
Read the reason for your ban closely. The reason will help you to understand what to avoid doing in the future, if your ban was justified.