The specific steps to send a link when buying something on Douyin are as follows:

1. First, open the Douyin app and find the video of the product you want to buy.

2. Then, click on the video to enter the video details page.

3. On the video details page, you can see the link to the product. This link is usually located in the comment area or product display area below the video.

4. You can click on this link directly and then make the purchase according to the prompts.

It should be noted that the product links on Douyin may be different, depending on the link method set by the merchant. Some merchants may use Douyin’s built-in product purchase function, while others may use external e-commerce platform links. Therefore, you need to click on the corresponding link to make the purchase based on the actual situation.