If your card reader is in "cloud" mode, meaning your card reader is independent of the pos you can set a default card reader on your device to connect automatically when making a payment.
1) Click on the hamburger button (3 horizontal lines) on the right hand side corner.
2) Select settings from the sidebar.
3) Select Device from the side panel.
4) Click on the default cloud card reader button.
5) You can see the list of available cloud readers. Card reader names may be different according to the configuration. Select the appropriate one.
The manual option is for card readers that are not integrated with Yuze. You can take the payments from other card readers and select manual here.
6) You can see the selected card reader on the button.