To display templates in videos posted on Douyin, you can follow the steps below:

First, select the video you want to post in the Douyin app.

Then, in the video editing interface, you can select the option to add a template.

After clicking on this option, you will see a series of different templates to choose from.

After browsing and selecting the template you like, click Apply Template.

At this point, you can make further edits to the template, such as changing text, adding filters, etc.

Once you have completed editing, click Confirm and continue to post your video. In this way, your video will display the selected template effect in Douyin. Remember to preview it before posting to ensure that the template effect meets your expectations.