Do I assign the IP address to my DSL modem? If so, how?

I'm a CenturyLink customer. Today I added a static IP address to our account. I've logged onto the DSL modem (an Actiontec C1000A DSL modem) and see that it has the IP address. But I'm wondering if I have to assign the IP address to it? I tried finding that information on the CenturyLink website, but couldn't find it there. So I've got a couple of questions. First, do I have to assign the static IP address somewhere in my DSL modem's configuration? And if so, where is it?

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