It will be 3 months before you can add the signature file. Secondly, an ID can only set five signature files. Also, it's best to use the pictures in the space album, so you have to upload the pictures first. First, upload a picture: In the upper right corner, there is "My Space". If the drop-down box has uploaded pictures, you can upload them. After uploading, click the uploaded picture, and if there is a copy link, copy it. Second, set the signature file: 1. Enter my I post bar. There is a "Settings" on the right of personal information, click Settings. 2. There are five contents above: basic information, signature file setting, attention invitation, mobile phone service and setting template. Click Signature File Settings, then click Add Signature File, fill in your name, paste the link you just copied, and then select Submit. Tip: After each signature file is submitted, it will be reviewed for a period of time. Only after approval can it be used when posting a reply!