Thanks, I used
dd if=xxx.iso of=/dev/sdc1
. When I removed the partition option 1 from the command, it worked.
However, I then face the problem of being unable to enter the proxy for the internet connection. As I am behind a university network, I need to be able to enter the proxy. However, unlike the steps shown in the link above, the installer for tumbleweed seems to not respond to F4, and I am unable to click on the boot screen.
Thanks.