You can go to the official website of China Construction Bank for self-service activation. The specific method is as follows:

1. First, use Baidu search to find the official website of China Construction Bank and click to enter, as shown in the picture.

2. After entering, select the "Credit Card" option on the official website home page, as shown in the figure below.

3. Then open "Online Card Opening" in the credit card interface, as shown in the picture.

4. Finally, enter the corresponding information as prompted by the system. After passing the verification, the credit card can be activated, as shown in the picture.