The specific analysis of how to sell products via private messages on Douyin is as follows:

1. If users want to open Douyin product sharing permissions, they need to find the [Creator Service Center] in [My], and then click on the next page to find the [Product Sharing Function].

2. Users need to search for [E-commerce Assistant] in Douyin, and then follow it and enter the personal homepage of [E-commerce Assistant]. Find and click [Private Message] - [Application Entry] - [Product Sharing Function] in the redirected page.

3. In addition, users can also enter the product showcase of other anchors, and then click [I also want to sell goods] to apply for the [Product Sharing Function].