1. Login to social media account.

2. Enter the profile or settings page.

3. Find the option or editing function of personalized signature.

4. Enter the desired signature in the personalized signature edit box, and set the visibility to "Visible only to yourself" or similar options. Different social media platforms may have different setting options, which can be adjusted according to the actual situation.

5. Confirm to save the settings for the changes to take effect.