There is a command "no service dhcp" to be executed on the Config mode. This will disable all DHCP services on the device.
I hope I have understood the question correctly because the above command I've mentioned will even disable "ip helper-address" relay functionality, so if you do not want the router to be involved any any kind of DHCP related activity then you can use this command.
I believe you should just need to delete the DHCP pool in CCA - this will stop the SR520 from acting as a DHCP server and offering addresses on the LAN.
I assume this is what you have required, rather than changing the addressing type on the WAN interface - by default the SR520-FE is configured to use DHCP to assign a WAN IP (as it often the case for broadband providers). If you need to set your own IP address, just select Static IP address in CCA for the Internet Connection and specify the required address, mask and DNS values.
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