Unlesss there's a good reason not to, I'd just turn on DHCP and be done with it. Let us know if that works!
It may be given a different DHCP address each time you switch it on - anywhere between 192.168.0.2 and 192.168.0.250-ish in your example. That will be completely transparent to you in most situations. You don't care. It's the easy way.
If you want to be able to connect to that PC from another location (eg home-to-work or vice-versa, via a "tunnel" or a Virtual Private Network), then you want it always to have the same IP address so you know its "address" on the Internet. In that case, instead of turning on DHCP, you would allocate it a fixed IP address and Default Gateway. You'd also have to tell the router about that IP address, and give it the MAC number (and maybe also the name) of the PC.
Saab Dastard's is like that - you see his has "DHCP enabled...No". Mine's the same (but different numbers).