Run program after uploading MKR

Hello to the forum!

I have just started with the Arduino.
I am working on the Charlie kit from Telit (in case anyone knows), this kit is stated to be compatible with the MKR form factor and the Arduino IDE.
(It allows data to be sent via a SIM card built into the board).

So I installed the IDE, the Atmel SAMD Core (based on the MKR GSM 1400).

I managed to upload the Basic Blink program. It puts me "done uploading" but the LED doesn't blink (it only blinks during the upload quickly).
I also uploaded a display program with System.print but nothing happens (even though it says "done uploading").

When it uploads, it says this at the end:
Atmel SMART device 0x10010005 found
Device : ATSAMD21G18A
Chip ID: 10010005
Version: v2.0 [Arduino:XYZ] Nov 13 2020 22:56:53
Address: 8192
Pages : 3968
Page Size: 64 bytes
Total Size : 248KB
Planes : 1
Lock Regions : 16
Locked : none
Security : false
Boot Flash : true
BOD : true
BOR : true
Arduino: FAST_CHIP_ERASE
Arduino: FAST_MULTI_PAGE_WRITE
Arduino : CAN_CHECKSUM_MEMORY_BUFFER
Erase flash
done in 0.843 seconds

Write 10940 bytes to flash (171 pages)
[==============================] 100% (171/171 pages)
done in 0.121 seconds

Verify 10940 bytes of flash with checksum.
Verify successful
done in 0.011 seconds
CPU reset.

I fund the solution here

Thank you also :wink: