You can add your logo to Login Screen of SambaPOS by following below step;

Prepare a PNG format of your image, name it as logo and put it into the Images folder that can be found in the folder which SambaPOS is installed.

You can find the folder that SambaPOS is installed in, by right clicking on the SambaPOS symbol from your computer’s desktop.

The path for the Images folder is like below as default;

C:\Program Files (x86)\SambaPOS5\Images