BuddyPress.org

I am trying to understand the process behind adding an edit screen to buddypress. I am using latest buddypress 3.0.0, bp_nouvea theme. I have created custom plugin and added new marketplace features to the logged in users profile area. I have screens set up to create products and to list the products but I cant figure out how to edit those products. I was hoping to be able to pass in a postID to the slug, and then when we load up the page with the $_GET variable set, we pull all data for the specified ID. Is there a better way to do this? here is what I have at the moment:

/**
	 * Add a new sub nav section for the marketplace. Create + add the marketplace edit link for the marketplace in the users profile.
	 */
	public function addMarketplaceEditNavItems() {
		global $bp;
		$marketPlaceEditItem = [
			'name'            => 'Create product listing',
			// Display name for the nav item.
			'slug'            => 'edit',
			// URL slug for the nav item.
			'parent_slug'     => 'myq_' . $this->name,
			// URL slug of the parent nav item.
			'parent_url'      => bp_loggedin_user_domain() . 'myq_' . $this->name . '/',
			// URL of the parent item.
			'item_css_id'     => 'myq-' . $this->name . '__edit',
			// The CSS ID to apply to the HTML of the nav item.
			'user_has_access' => bp_is_my_profile(),
			// Can the logged in user see this nav item?
			'position'        => 100,
			// Index of where this nav item should be positioned.
			'screen_function' => [ $this, 'addMarketplaceEditScreen' ],
		];
		bp_core_new_subnav_item( $marketPlaceEditItem );
	}