Bat Chat is an encrypted chat software designed to protect the security of users' chat content. If you want to make an appointment on bat chat, you can try the following steps:

1. Install and open the bat chat software, and log in with the mobile phone verification code.

2. In the chat interface, click the+sign in the upper right corner and select the "Add Friends/Groups" option.

3. Enter the Bat ID of the friend you want to add in the search bar, or scan their QR code to add.

After the other party passes your request, you can communicate with them in the chat interface.

Please note that dating behavior should be true and respectful. If you violate the law or ethics, your Bat chat account may be suspended or permanently banned.