Sometimes the qq system may be busy, or there are too many words or symbols in your signature. At this time, the system will not prompt, that is, the modification failed, or there may be too much junk information on your computer, which will be blocked. If it is the above problem, the solution: delete some redundant words or symbols and modify them again, and the system will prompt that the modification is successful. If the system is busy, just wait for a while and then modify it. If not, please refer to another ingenious solution, thank you ~'