For Ride Sharing
If you need a ride, start a thread for yourself in the Ride Needed category, or reply to an open thread in the Ride Available category. (If you have space available, post there.)
To select the category when starting a new thread, use the drop down box right below where you set the title of your post.
For Gear
Start a thread for what you need or have to offer in the Trading Post. For guidelines regarding that, see About the Trading Post category.