In order to become best friends on Snapchat, you must communicate with them more than you communicate with most of your other friends.  Your friend also must communicate with you in the same manner if they want you on their Best Friends list. You can have up to six best friends. Tap the Snapchat app icon, which resembles a white ghost on a yellow background. The Snapchat camera will open if you're logged in. If you aren't logged in, tap LOG IN, enter your username (or email address, or phone number) and password, and tap LOG IN. It's in the top-left corner of the screen. This will open your profile page. This option is in the middle of the page. If you're physically near your friend and they have Snapchat open, you can instead have them scan your snapcode that appears at the top of your profile page. It's at the very top of the screen. Your phone's keyboard will pop up. This will search the Snapchat database for them. You should see your friend's username appear in the middle of the page. It's next to your friend's username. This will add them to your Snapchat friends list. Once your friend adds you to their friends list, you can proceed with snapping them to your heart's content.

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Write a summary of the previous text in Chinese:
了解“挚友”列表的规则。 打开Snapchat。 点击头像。 点击添加好友。 点击搜索栏。 输入好友的用户名。 点击+添加。 要求他们也将你添加为好友。