It's a blue icon with a white "P." You'll usually find it on the home screen or in the app drawer. If you haven't yet endorsed the check you want to deposit, do so before you continue. It's near the top of the screen. It's at the bottom of the screen. Some quick instructions will appear on the screen.  Follow the on-screen instructions to grant PayPal permission to access your location and camera. Once the proper permissions are granted, a privacy policy will appear.   You'll have to provide your birthdate, social security number, and phone number to continue. Now you'll enter some information about your check. Tap $0.00 at the top of the screen, then enter the check's total amount. The camera screen will appear. The app will capture the check's image immediately. The camera screen will re-open. The app will capture the check's back side. It's at the bottom of the screen. You'll see different fees associated with each option. PayPal's check service will now verify the check's validity. This process should only take a few seconds, but sometimes may require up to 5 minutes. Don't continue to the next step until you see a message that says that the check is approved. Don't void the check until the app prompts you to do so. When it does, use a thick marker to write "VOID" across the front of the check, and then follow the on-screen instructions to snap a new photo of the check. A confirmation will appear once this process is complete.

TL;DR in Chinese:
在手机或平板电脑打开PayPal应用。 点按靠近屏幕顶端的余额。 点按屏幕底部的充值。 点按兑现支票。 点按开始。 授权PayPal应用访问你的位置和摄像机。 查看隐私政策，然后点按同意。 查看条款和条件，然后点按同意。 输入你的个人信息，然后点按继续。 在确认页面上，点按完成。 输入支票金额。 点按支票正面。 将支票正面对准指示线。 点按支票背面。 将支票翻面，对准指示线。 点按屏幕底部的下一步。 选择你愿意等待的处理时间。 点按确认。 作废支票，并提供证据。