First, you have to have a certificate. This is an online application based on the serial number of your mobile phone. It used to be easy to apply. Now it costs 200 yuan to make a certificate account, so in order to save money, go to some forums to find good people to help you make a certificate, such as cer.dospy.com or

www.cnpda.com.cn

You can apply for a certificate inside. After you apply for the certificate, you can use the signature tool given by the forum to sign the required software, such as the software S60V3 of sogou Phonetic Pinyin Input Method. Signing method: it will be introduced in the general signing software, which is very simple. Of course, there are more detailed signing tutorials in the forum, which I hope will be useful to you.