Use the following steps to make a content type translatable:

1. Access your site.

2. In the left sidebar, click Structure > Content types.
3. Select the content type that you want to make translatable.
4. Click the Language settings tab.
5. Enable the Enable translation toggle.
6. Click Save.
7. In the left sidebar, click Configuration > Region and language > Content language and translation.
8. Check the content types and fields that must be translatable.
9. Click Save.