Prefix?

I want to post a new thread. I am asked to choose the prefix otherwise the post is not released. There are 5 prefix options, which one should I take? No idea about their meanings.

Welcome to MPGH! Which forums are the prefixes for?

Welcome, it all depends where you want to post your thread in. In the Market place, WTB = Want to Buy, WTS Want to Sell, WTT Want to Trade, the prefixes are pretty logic. You can always just choose none, or other.