Hiya,
Were you able to upload the example in the first tutorial?
To see the right board's port, you want to make sure the hardware is turned ON and you are selecting the right items in the Arduino IDE.
You should be able to select "TinyScreen+" for your Board under the "TinyCircuits SAMD Boards" option found in the Tools/Board menu. The SAMD21 processor is made by Atmel, but it is not an 'ATMEL' board, so that would be incorrect to select.
There's a photo reference here for what to select:
https://learn.tinycircuits.com/Help/Upload_Arduino_Programs/#tinyscreenThe 'Arduino as ISP' shouldn't be an option from what I can tell. the two options you need to change in the Tools menu are the board (TinyScreen+) and the Port (COM# (TinyScreen+)) - everything else you should be able to leave as the default selections. Then just press the 'Upload' arrow button.
I hope that helps!
Cheers,
RĂ©na