1. Open Aauto Quicker APP on your mobile phone and log in to your account.

2. Find the group for which you want to set the welcome language, and click the setting icon in the upper right corner of the group page to enter the group setting interface.

3. In the group setting interface, look for relevant options under the tabs of "Group Announcement" or "Group Management".

4. After entering the welcome language setting page, edit the content of the welcome language. You can write a welcome message for new members as needed, such as greetings, group rules reminding or introducing the characteristics of the group.

5. After editing the welcome message, click the Confirm or Save button to complete the setting. At this point, new members who join the group will see the welcome message.