During the PK match between two anchors, viewers can vote for the anchors they support in the following ways:

1. Follow the live broadcast platform: First, viewers need to follow the live broadcast platform that hosts the PK match, such as Huya, Douyu, Douyin, etc.

2. Enter the live broadcast room: Viewers need to enter the live broadcast room of the anchor participating in the PK match before they can vote for them.

3. Obtain voting qualifications: Some live broadcast platforms may require viewers to complete real-name authentication or reach a certain credit level before they can participate in the vote. Therefore, viewers need to meet the platform's voting qualifications first.

4. Like and send gifts: Viewers can like and send gifts to the anchors they support in the live broadcast room. The number of likes and gifts will be converted into votes, which will increase the anchor's points. Generally speaking, the higher the amount of gifts, the more votes you will get.

5. Participate in interaction: Some live broadcast platforms also have interactive sessions, such as answering questions and guessing. Viewers can get extra votes by participating in the interaction and cheer for the anchor.

6. Pay attention to official events: Sometimes, the live broadcast platform will hold some theme events. Viewers who pay attention to and participate in the events will also have the opportunity to get extra votes.

7. Canvassing: Viewers can also invite friends and family to vote for their favorite anchors to increase their support rate.

It should be noted that the specific voting methods of each live broadcast platform may be different, and viewers need to participate in the voting according to the actual situation. During the voting process, you must abide by the platform regulations and do not maliciously swipe votes or use improper means to avoid affecting the fairness of the game.