the activity/participation thresholds are very low to get to basic user level. and likewise to become a regular. honestly if you’re actually reading the forum even rarely you’ll become a regular quickly.
the decision was made to prevent user signups that are solely to repost ebay links, etc.
the whole point of a trade category is to have allow trading within the community, not for outsiders to solicit trade to/from the community.
becoming a part of the community just means participating, so, welcome!