i got the "Seeeduino LoRaWAN" and everything worked well

Hi, i got the “Seeeduino LoRaWAN” and everything worked well. Now I cant upload any Sketches and receive the error:
WARNING: Category ‘’ in library FlashStorage is not valid. Setting to ‘Uncategorized’
Sketch uses 8516 bytes (3%) of program storage space. Maximum is 262144 bytes.
No device found on ttyACM0
An error occurred while uploading the sketch

I wanted to burn the Bootloader but i cant find the pins to do that. Can you pleas answer how i can connect the programmer with my board or what i could do else?

Hi there~


Please double press the reset button.

Thanks

best rgds
Bill