Set the personal homepage background image: Open the Tik Tok application. Go to the personal homepage and click "I" in the lower right corner. Find and click the settings entry on the personal homepage, which may be the personal portrait area at the top, or the options such as "background" and "edit data" in the page. In the page where you set or edit data, you can find the relevant options to modify the background map, generally "Background Settings" or "Home Page Background". According to the prompt, you can choose the background template provided by Tik Tok, or you can choose a custom picture from the mobile phone album as the background. After selecting a picture, set the position and size of the picture according to the page prompts, and then save the settings.
Set chat background: open Tik Tok's friend chat interface. Click more options (usually ellipsis or three-point icon) in the upper right corner of the chat window. Select Set Chat Background or similar option from the pop-up menu. On the chat background setting page, you can choose the background picture built in Tik Tok or choose a photo from the mobile phone photo album as the chat background. After selecting the background picture, click OK or save the changes, and the chat background will change accordingly.