Use "curl http://" in cmd

[frogro]

Hi,
can someone please give me advice how to transfer the following command, which works in lxterminal, to the config file:
curl http://10.3.141.52:14711/commands/start-picture
MAC adress of the dash button is FC:A6:67:EC:B1:76
User: pi
I tried
## Execute a system command FC:A6:67:EC:B1:76: name: DashButton cmd: curl http://10.3.141.52:14711/commands/start-picture
but without success...