OK. Leave it as it is, if I were you.
You don't really need to know what DHCP is, but here goes anyway:
All computers on networks have to have their own number, like houses have to have house numbers so that things coming to them get there, and not to some other computer. These numbers are called IP addresses, and all computers on any network (subnet technically) must have their own unique one. They're like 64.35.149.250 or something like that.
Your router creates your own little home network, and so for all your computers to able to use the internet you must assign each computer its own IP address. The router will have the IP address that your ISP sends you, your 'public' one that everyone can see.
Normally you'd have to assign IP addresses yourself, such as 192.168.2.2 for your computer, 192.168.2.3 for your laptop, etc. This is hassle. So, DHCP does this hard work for you -- when a computer connects to the router, it gets the next available IP address automatically, thanks to DHCP.