How to set Wechat floating window icon?

how to set the Wechat floating window icon, as shown in the figure is now a link logo, want to customize the icon.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1c0da1b-150c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1c0da1b-150c8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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