As a person who brushes Weibo every day, I know this problem, so let me demonstrate:

Weibo version used in the demonstration steps: 12. 10.0.

1. After opening Weibo, click "Message" below, then find and click "Subscribe to Message".

2. After opening, click the "+"sign in the upper right corner.

3. Slide to find the blogger you want to subscribe to, and then click "Subscribe".