Why has the personalized signature posted on QQ been automatically changed? Want to know how to solve it?

Entering personal space, there is a gear-shaped icon in the upper right corner of the interface, which contains? Space setting? Item, after clicking in, there is on the left? Synchronization settings? Item, what's in the middle after clicking in? Synchronize QQ signature? Item, put it? "Synchronous space call to QQ signature"? Remove the preceding √ sign and click? Save? It doesn't matter.