You can mark it according to the following steps.

1. Open Baidu search engine and click on the map.

2. Find the merchant free label at the bottom and click on it.

3. Click to authenticate now. Only when the authentication is passed and there is legal proof, can it be marked.

4. Click to add a new location.

5. After clicking, you will be asked to fill in the address, place name and other information. After entering, submit and wait for review. After the review is passed, you can see the marked information on the map.